  The observed spectrum of ultrahigh energy neutrinos at IceCube might be
indicative of absorption of such neutrinos in ultralight dark matter halos. We
point out that various features of this spectrum can be explained by such
absorptions. For a light $Z^\prime$-mediated $t$-channel interaction between
dark matter and neutrinos, we propose a novel mechanism of absorption of these
neutrinos at particular energies. This can save the models of AGN predicting
large neutrino flux at energies more than a PeV.
