  We study the possibility that primordial black holes (PBHs) can be formed
from large curvature perturbations generated during the waterfall phase
transition due to the effects of one-loop radiative corrections of Yukawa
couplings between the inflaton and a dark fermion in a non-supersymmetric
hybrid inflationary model. We obtain a spectral index, $n_s$ and a
tensor-to-scalar ratio, $r$ consistent with the current Planck data. Our
findings show that the abundance of PBHs are correlated to the dark fermion
mass $m_N$ and peak in the GW spectrum. We identify parameter space where PBHs
can be the entire dark matter (DM) candidate of the universe or a fraction of
it. Our predictions are consistent with any existing constraints of PBH from
microlensing, BBN, and CMB, etc. Moreover, the scenario is also testable via
induced gravitational waves (GWs) from first-order scalar perturbations
detectable in future observatories such as LISA and ET. For instance, with
inflaton mass $m \sim 2\times 10^{12}$ GeV, $m_N \sim 5.4\times 10^{15}$ GeV,
we obtain PBHs of around $10^{-13}\, M_\odot$ mass that can explain the entire
abundance of DM and predict GWs with amplitude $\Omega_{\rm GW}h^2$ $\sim
10^{-9}$ with peak frequency $f$ $\sim$ $0.1$ Hz in LISA. By explicitly
estimating fine-tuning we show the model has very mild tuning. We discuss
successful reheating at the end of the inflationary phase via the conversion of
the waterfall field into standard model (SM) particles. We also briefly
speculate a scenario where the dark fermion can be the possible heavy
right-handed neutrino (RHN) which is responsible for generating the SM neutrino
masses via the seesaw mechanism. The RHN can be produced due to waterfall field
decay and its subsequent decay may also explain the observed baryon asymmetry
in the universe via leptogenesis.
