Malicious PDF — malware analysis report

Static analysis result for SHA-256 00188d29c1988f80…

MALICIOUS

PDF

11.5 KB Created: 2015-07-15 14:36:45 +04:00 Authoring application: DOMPDF
MD5: ab8313a7ac84016a2db01c3505353bdc SHA-1: c545fce1be2fa789e5260f47b68cd6403cd21d3c SHA-256: 00188d29c1988f80697d0a6c3ef72e9fa2539d5e2a326b7b65fa855068ee650b
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded URLs, forming a link farm. This is indicative of SEO manipulation or a redirection scheme to host malicious content. The ML classifier also flagged the PDF as malicious, supporting this assessment. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the specific payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8959

Heuristics 2

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://photo-file.ru/index.php?article=234.1&wehsa=1&pdf=234
    • http://krummenacher-haustechnik.ch/index.php?article=2021.1&ptfan=1&pdf=2021
    • http://casarosso.com.tr/index.php?article=937.1&gdggi=1&pdf=937
    • http://photo-file.ru/index.php?article=1449.1&wehsa=1&pdf=1449
    • http://www.amenagementboislyon.com/index.php?article=2388.1&jnfas=1&pdf=2388
    • http://photo-file.ru/index.php?article=1966.1&wehsa=1&pdf=1966
    • http://www.mantrabeautybar.ca/index.php?article=1820.1&rukbv=1&pdf=1820
    • http://www.fabulaeventos.com.br/index.php?article=1874.1&ipwdu=1&pdf=1874
    • http://www.robinprime.com/index.php?article=342.1&bedxv=1&pdf=342
    • http://photo-file.ru/index.php?article=1124.1&wehsa=1&pdf=1124
    • http://photo-file.ru/index.php?article=2487.1&wehsa=1&pdf=2487
    • http://photo-file.ru/index.php?article=2495.1&wehsa=1&pdf=2495
    • http://www.ivanandpamela.com/index.php?article=490.1&tekgj=1&pdf=490
    • http://photo-file.ru/index.php?article=875.1&wehsa=1&pdf=875
    • http://www.authenticness.com/index.php?article=1950.1&aqdto=1&pdf=1950
    • http://photo-file.ru/index.php?article=1209.1&wehsa=1&pdf=1209
    • http://fresh2death.com/index.php?article=562.1&lzrlo=1&pdf=562

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_000_off000002e7.js
c802f45f1f90bc6ef6ec50b3d31b5747897a9873e78d00781aa37c2e06ab6888
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2E7 13049 bytes