Malicious PDF — malware analysis report

Static analysis result for SHA-256 32508906bd7fb3a8…

MALICIOUS

PDF

59.5 KB Created: 2021-04-10 15:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9acb0af706a036ec0a8c50beb3d5d47 SHA-1: 68bacc47aeaac748c2495be4f34f830d58ed01f5 SHA-256: 32508906bd7fb3a846d8f96a62f7d2d622d80318003db99f45ad9621f6e3ed7e
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The document body, though heavily obfuscated, suggests a lure related to killing an octopus, which is likely a pretext to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/gurasijam.pdf
    • https://www.uts.cw/sites/default/files/webform/50818196885.pdf
    • http://www.birdlifebotswana.org.bw/sites/default/files/webform/sightings-sketches/bikepekeroluxujopabiko.pdf
    • https://www.natsihwa.org.au/sites/default/files/webform/bukitonixoravutewoluba.pdf
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/6948618973.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/15691680518.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/zuloliresu.pdf
    • https://aboss.by/sites/default/files/webform/vobefoxejajizagosoberob.pdf
    • http://seiary.com/sites/default/files/webform/rec/jizexatunurometubukos.pdf
    • https://www.dgs-interparts.be/sites/default/files/bipaxuvimul.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/19824170549.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=comment+tuer+un+poulpe
    • https://ec.europa.eu/eip/agriculture/sites/default/files/webform/66140853426.pdf
    • https://drones.princeton.edu/system/files/webform/voretazejujuwewoz.pdf
    • https://www.ice.cam.ac.uk/sites/www.ice.cam.ac.uk/files/webform/wosevojowavinojefe.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d19c.bin
3f0d12132358d8b8a65809b61c6cb7fcb81f0f70d5a7fe77f3e8fe9ad12dc864		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD19C 4480 bytes

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