/usr/bin/scan-build-3.5 is in clang-3.5 1:3.5.2-3ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/bin/../share/clang/scan-build-3.5/scan-build
/usr/bin/../share/clang/scan-build-3.5/scan-build