Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe1a05ad9ad6de1…

MALICIOUS

PDF

54.8 KB Created: 2020-04-05 10:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a03dacb1526e0c8ba43159461ce2e541 SHA-1: 45a006f2eddb796e1e2271766e0c53b88c54c778 SHA-256: 4fe1a05ad9ad6de1c17393bd990d869dc4871fc284bcbbdd7da96e892ae89567
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files on various domains, indicating a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, contains a URL that appears to be a lure. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to a network of external sites, likely for phishing or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://rhhandyman.net/uploads/1/3/0/5/130539940/130539940.html#guia+protocolo+de+investigacion+ops
    • http://saeart.com/uploads/1/3/0/5/130589401/riraf.pdf
    • http://ambrosialart.com/uploads/1/3/0/5/130551248/firavuxod_bofikevabipin_mifog_sutoso.pdf
    • http://understanding-pain.com/uploads/1/3/0/4/130488198/1346037.pdf
    • http://midsomersetmartialarts.com/uploads/1/3/0/5/130542755/5816330.pdf
    • http://botoxbuyersguide.com/uploads/1/3/0/9/130969818/7355662.pdf
    • http://stillazafu.com/uploads/1/3/0/5/130590278/sapitubukibo_tisejeduwo.pdf
    • http://netmotiondemo.com/uploads/1/3/0/5/130588517/5212314.pdf
    • http://rkcguns.com/uploads/1/3/0/4/130476491/7675769.pdf
    • http://timings.ca/uploads/1/3/0/6/130640183/35b056d95e.pdf
    • http://fitpantherapparel.com/uploads/1/3/0/8/130813528/mafanajef-bafek-sulelo-ledufakepag.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000097a3.bin
58a43df88ff522c1717a9a6f52b951d8f682205b11fc413cd8c729aad1dc7b97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97A3 9596 bytes
font_01_sfnt_off0000b9d2.bin
e5ccfd3f99ebc43cdff36d9dbb23b893a35b61ae846029f319c9c4559a202207		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D2 16112 bytes

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