  Recent observation of high energy neutrino in IceCube experiment suggests
existence of superheavy dark matter beyond PeV. We identify the parent
particles of neutrino as two degenerated right handed neutrinos, assuming the
dark matter is the heaviest right handed neutrino. The $O(V_{cb})\sim
O(10^{-2})$ flavor symmetry breaking accounts for the $O(10^{-4})$ mass
degeneracy of right handed neutrinos which is a sizable scale to explain the
successful resonant leptogenesis at the PeV scale. At the same time,
non-thermal production of the heaviest right handed neutrino gives the right
amount of dark matter for $T_{RH}\sim 10$PeV. The footprint of flavor symmetry
is left in degenerated mass spectra of extra Higgs multiplet and colored Higgs
multiplet which may be testable for LHC or future colliders.
