/etc/pam.d/perdition is in perdition 2.2-3ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | #%PAM-1.0
auth required /lib/security/pam_unix.so shadow
auth required /lib/security/pam_nologin.so
account required /lib/security/pam_unix.so
password required /lib/security/pam_cracklib.so
password required /lib/security/pam_unix.so shadow nullok use_authtok
session required /lib/security/pam_unix.so
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