  We propose a minimal extended seesaw scheme based on the discrete symmetry
$A_4\times Z_4\times Z_2\times Z_8$ which can successfully address neutrino
phenomenology and keV sterile neutrino dark matter. The lepton mass hierarchy
is naturally achieved. Active neutrino mixing angles can reached the best-fit
points with the predictive Dirac CP violation phase. The active-sterile mixing
matrix elements are small enough to access the observed cosmological dark
matter abundance constraint with keV sterile neutrino dark matter. The
effective neutrino masses are predicted to be in the ranges of the recent
experimental limits.
