The ebuild seems to be missing SRC_URI arrows to rename the distfile: 2.5.2.tar.gz
commit 8a9f3ad2a6310badb6499c7eb4f45686e6175fd2 Author: David Seifert <soap@gentoo.org> Date: Fri Jun 2 19:00:41 2017 +0200 app-misc/scrub: [QA] Use proper distfile name Bug: https://bugs.gentoo.org/show_bug.cgi?id=619842