  Scale-invariant extensions of the electroweak theory are not only attractive
because they can dynamically generate the weak scale, but also due to their
role in facilitating supercooled first-order phase transitions. We study the
minimal scale-invariant $U(1)_{\rm D}$ extension of the standard model and show
that Primordial Black Holes (PBHs) can be abundantly produced. The mass of
these PBHs is bounded from above by that of the moon due to QCD catalysis
limiting the amount of supercooling. Lunar-mass PBHs, which are produced for
dark Higgs vev $v_\phi\simeq 20~\rm TeV$, correspond to the best likelihood to
explain the HSC lensing anomaly. For $v_\phi\gtrsim 400~\rm TeV$, the model can
explain hundred per cent of dark matter. At even larger hierarchy of scales, it
can contribute to the $511~\rm keV$ line. While the gravitational wave (GW)
signal produced by the HSC anomaly interpretation is large and detectable by
LISA above astrophysical foreground, the dark matter interpretation in terms of
PBHs can not be entirely probed by future GW detection. This is due to the
dilution of the signal by the entropy injected during the decay of the
long-lived $U(1)_{\rm D}$ scalar. This extended lifetime is a natural
consequence of the large hierarchy of scales.
