  We have studied dark matter (DM) phenomenology, neutrinoless double beta
decay (NDBD) and realized low scale leptogenesis in an extension of Standard
Model(SM) with three neutral fermions, a scalar doublet and a dark sector
incorporating a singlet scalar and a Dirac singlet fermion. A generic model
based on $A_4\times Z_4$ flavor symmetry including five flavons is used to
explain both normal and inverted hierarchy mass patterns of neutrino and also
to accommodate the dark matter mass. In this extension of the $\nu$2HDM, the
effective neutrino mass observed in $0\nu\beta\beta$ is well within the
experimental limit provided by KamLAND-ZEN. In order to validate DM within this
model, we have checked relic abundance and free streaming length of the dark
sector component, i.e. a Dirac singlet fermion constraining its mass in keV
range. More importantly we have also realised low scale leptogenesis
simultaneously within this framework and also the Dirac CP phase gets
constrained with the results. Bound from LFV is also incorporated in order to
constrain the Yukawa couplings. More importantly, we have analyzed the
dependence of various phenomenology with decay parameter for different choice
of arbitrary complex angles.
