  A minimal extension of the Standard Model (SM) by a vector-like fermion
doublet and three right handed (RH) singlet neutrinos is proposed in order to
explain dark matter and tiny neutrino mass simultaneously. The DM arises as a
mixture of the neutral component of the fermion doublet and one of the RH
neutrinos, both assumed to be odd under an imposed $\mathcal{Z}_2$ symmetry.
Being Majorana in nature, the DM escapes from $Z$-mediated direct search
constraints to mark a significant difference from singlet-doublet Dirac DM. The
other two $\mathcal{Z}_2$ even heavy RH neutrinos give rise masses and mixing
of light neutrinos via Type-I Seesaw mechanism. Relic density and direct search
allowed parameter space for the model is investigated through detailed
numerical scan.
