/usr/bin/urlbst is in texlive-bibtex-extra 2013.20140215-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/bin/../share/texlive/texmf-dist/scripts/urlbst/urlbst
/usr/bin/../share/texlive/texmf-dist/scripts/urlbst/urlbst