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In this paper, we revisit a scale-invariant extension of the standard model(SM) with a strongly interacting hidden sector within AdS/QCD approach. Usingthe AdS/QCD, we reduce the number of input parameters to three, {\it i.e.}hidden pion decay constant, hidden pion mass and $\tan\beta$ that is defined asthe ratio of the vacuum expectation values (VEV) of the singlet scalar fieldand the SM Higgs boson. As a result, our model has sharp predictability. Weperform the phenomenological analysis of the hidden pions which is one of thedark matter (DM) candidates in this model. With various theoretical andexperimental constraints we search for the allowed parameter space and findthat both resonance and non-resonance solutions are possible. Some typicalcorrelations among various observables such as thermal relic density of hiddenpions, Higgs boson signal strengths and DM-nucleon cross section areinvestigated. We provide some benchmark points for experimental tests.

AdS/QCD approach to the scale-invariant extension of the standard model with a strongly interacting hidden sector