Malicious PDF — malware analysis report

Static analysis result for SHA-256 e08d352621f68773…

MALICIOUS

PDF

31.6 KB Created: 2020-04-20 04:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d49a7fb0a6167321ecd820364e376a34 SHA-1: a280430c17445a71b6afabdc9c92da9402f46de5 SHA-256: e08d352621f68773b274a2925e1091ff614e812f7953d3ee51a02994ca71c207
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links, many of which point to similarly structured URLs on different domains. The document body, though heavily obfuscated, contains a reference to a 'voluntary demotion request letter template' and a URL that matches one of the extracted links. This suggests a link farm or SEO poisoning technique to drive traffic to potentially malicious or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9634

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://chsbahamas.com/uploads/1/3/0/8/130815582/130815582.html#voluntary+demotion+request+letter+template
    • http://shelleykuriatadesign.com/uploads/1/3/1/4/131406762/1743246.pdf
    • http://interdependenceday.blog/uploads/1/3/0/7/130775308/lepewemunulefege.pdf
    • http://kamproductions.biz/uploads/1/3/0/7/130775723/fef1e4960842db8.pdf
    • http://journeyemovies.com/uploads/1/3/0/6/130603935/8847536.pdf
    • http://vagabands.com/uploads/1/3/0/6/130621727/xowuvoteripivudojulu.pdf
    • http://answerit.ca/uploads/1/3/0/6/130620345/kisawinas.pdf
    • http://tipsonnails.com/uploads/1/3/0/6/130621790/8662276.pdf
    • http://nevillekillian.com/uploads/1/3/0/7/130776444/7425420.pdf

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067e6.bin
f2090fe37a90e5967822284dbac28aa5fb07bc97c09e1633f5e5de0295af9b49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67E6 7440 bytes

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