Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5df820abc9416f…

MALICIOUS

PDF

63.9 KB Created: 2021-04-18 20:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b3773bde6df510c7ed907e1e1a85f06 SHA-1: f96e338f498121d70236d5bef06d9c06c0a9a5ba SHA-256: 5c5df820abc9416fca21e30bd2513c14c6d4d52e0eb1eeffb0e6301bd085a944
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8608

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 http://oaklandchildcare.org/sites/default/files/webform/70037852461.pdf
    • http://pilgrimland.com/sites/default/files/webform/resume-uploads/2923424149.pdf
    • http://portal-mysigma.com/system/files/student-proof/47432021317.pdf
    • http://pilgrimland.com/sites/default/files/webform/resume-uploads/mikax.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/sidetarebuw.pdf
    • https://architecturaldesigninc.com/sites/default/files/56675633315.pdf
    • http://www.grotekeukens.be/sites/default/files/webform/gmawards2018/dakatiwilu.pdf
    • https://www.a1touchsolution.nl/sites/default/files/26511902049.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/dakorudi.pdf
    • https://www.jts.org.jo/sites/default/files/webform/96043924660.pdf
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/basolidigululaba.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/nutuzisujobipusife.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+become+a+business+analyst+in+canada
    • https://www.ice.cam.ac.uk/sites/www.ice.cam.ac.uk/files/webform/ruwitik.pdf
    • https://ec.europa.eu/eip/agriculture/sites/default/files/webform/juvuwudonuvusenovirem.pdf
    • https://www.healthdata.org/sites/default/files/resumes/fanonexujezurexuli.pdf
    • https://minorsoncampus.princeton.edu/system/files/webform/27732669772.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d183.bin
5c4692f0848272f5910efe95b0532331f9bfd3b9481d130719e2936f0a38a14c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD183 5284 bytes

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