Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f5ebdfd455c9bca…

MALICIOUS

PDF

74.9 KB Created: 2021-04-09 17:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03478a93860c7d41e3e23c2ea2bfc370 SHA-1: 4d8c3d1d7f51f8c1e2237916b5d5d22ae7ff3f5a SHA-256: 7f5ebdfd455c9bcafb2ce30d5bf9c6aa2d44007fec562e52beb44f2ecbb011e6
124 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm designed to obscure the true destination of the embedded URLs, which are presented in a deceptive manner related to a popular album download. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8924

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.blplegal.com/sites/default/files/webform/89971565628.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/68138040624.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/palepipob.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/14219433733.pdf
    • https://www.jwico.com/sites/default/files/webform/vuvosiritixulufanili.pdf
    • https://natsihwa.org.au/sites/default/files/webform/17015803.pdf
    • https://www.mainephilanthropy.org/sites/default/files/ziladiweropisikiforab.pdf
    • http://www.birdlifebotswana.org.bw/sites/default/files/webform/sightings-sketches/lewuxevibonotokezesa.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/53132673180.pdf
    • http://seiary.com/sites/default/files/webform/rec/47545977947.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/99469138220.pdf
    • https://www.natsihwa.org.au/sites/default/files/webform/bukitonixoravutewoluba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=kanye+west+graduation+album+download
    • https://ec.europa.eu/eip/agriculture/sites/default/files/webform/juvuwudonuvusenovirem.pdf
    • https://campusrec.princeton.edu/system/files/webform/luzatebinibaxopititum.pdf
    • https://community.princeton.edu/system/files/webform/26098210740.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103a3.bin
b4f5f01d19e635ee85d24496a2f4dc36f17c05c8548e4a31ef1b3aec89181387		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103A3 5448 bytes

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