Malicious PDF — malware analysis report

Static analysis result for SHA-256 534d7dd2722e433b…

MALICIOUS

PDF

66.7 KB Created: 2021-04-12 18:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b499520b53a65033456d562bba6c2cb SHA-1: 24698079f8a35965421dae61598aecb7d2050f07 SHA-256: 534d7dd2722e433bb579368ce9d74804181ce7e191ea0a61ee01eaf198461bfb
124 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The PDF contains numerous embedded links, many pointing to disposable or unknown hosts, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate an attempt to direct users to external, potentially malicious, web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9660

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://www.friendlycc.com/sites/default/files/webform/98819861428.pdf
    • http://pilgrimland.com/sites/default/files/webform/resume-uploads/64296936159.pdf
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/95133977644.pdf
    • https://natsihwa.org.au/sites/default/files/webform/17015803.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/tajiwugebewozebukak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=acuerdo+ministerial+de+evaluacion+2018
    • https://minorsoncampus.princeton.edu/system/files/webform/xadumiwedom.pdf
    • https://gradfutures.princeton.edu/system/files/webform/48950823745.pdf
    • https://printandmail.princeton.edu/system/files/webform/21250884575.pdf
    • https://ubmemeaensoprod.s3.amazonaws.com/ifsec_international/call_for_papers/2021/03/jonigumeneritid.pdf
    • https://lib.asu.edu/system/files/webform/98562832035.pdf
    • https://thesanfordschool.asu.edu/sites/default/files/webform/87767597376.pdf
    • https://ec.europa.eu/eip/agriculture/sites/default/files/webform/66140853426.pdf
    • https://printandmail.princeton.edu/system/files/webform/67925993666.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5bb.bin
2776cd3341d285bbf99229343c1e7f85daba88428e39e70afc83b76b9399a562		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BB 5656 bytes

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