my %count;
while (<FILE>) {
    my( $src, $sport ) = (split /;/)[9,12];
    $count{$src,$sport}++;  # magic $;
}

for my $pair ( sort keys %count ) {
    print "($pair) occurred on a line together $count{$pair} times\n";
    # if you need the two parts:
    # my( $src, $sport ) = split $;, $pair;
}