Malicious PDF — malware analysis report

Static analysis result for SHA-256 80220323ab48fc66…

MALICIOUS

PDF

34.5 KB Created: 2020-06-15 18:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3282759e719215d7704ca83594367c9 SHA-1: 973c247bdf48c8f1ac56128fc2fb158a865ba12d SHA-256: 80220323ab48fc66c6e90e1e890d4b77e729e6b06fe8d4e2dc654ac6b8bef8b4
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains, indicating a link farm or SEO abuse tactic. The primary URL, http://9mn3i.bpmtc.com/uploads/1/3/0/3/130323811/130323811.html#2011+form+8949+instructions+pdf, is presented as tax form instructions, a common lure. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://9mn3i.bpmtc.com/uploads/1/3/0/3/130323811/130323811.html#2011+form+8949+instructions+pdf
    • http://ryan-armstrong.com/uploads/1/3/0/9/130969627/wuwerovitosadoxivu.pdf
    • http://pixelsperinchs.org/uploads/1/3/0/6/130639192/nelagaxinaki_movijefurub.pdf
    • http://xrevster.com/uploads/1/3/0/5/130539225/meviwanov-rexoxazikalap.pdf
    • http://mail.yongintaekwondocollege.com/uploads/1/3/0/3/130313021/b35847140521c32.pdf
    • http://fullyjess.com/uploads/1/3/0/2/130271077/0aa830ba11fef59.pdf
    • http://smallbusinessadviceweek.com/uploads/1/3/0/7/130739944/9288500.pdf
    • http://thriftstorehemet.com/uploads/1/3/1/8/131856772/4308687.pdf
    • http://johnhdouglass.com/uploads/1/3/0/5/130543346/ronodezog.pdf
    • http://3xa.undesirable.us/uploads/1/3/0/6/130639180/2292539.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c49.bin
2e85762e457fd58591b75dbe86a881987cd44a0f7eeea1e63e239cc7103666d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C49 10184 bytes

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