/usr/lib/libkbookmarkmodel_private.so.4 is in kde-baseapps-bin 4:4.14.2-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libkbookmarkmodel_private.so.4.14.2
/usr/lib/libkbookmarkmodel_private.so.4.14.2