Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb659a11128e1a96…

MALICIOUS

PDF

63.9 KB Created: 2021-04-26 01:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a978fb36c65a213c7e4bb713a971155 SHA-1: 6f98219eec782c3abb3afe5a1b970eec0d2bf93b SHA-256: cb659a11128e1a96b558d78ab01fa27a0a6295bf8d1d94f33e627f774c6d7b76
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. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on disposable domains. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8289

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.osgeurope.com/sites/osg-corporate.dev/files/webform/memirudomonejusowanasu.pdf
    • https://www.dgs-interparts.be/sites/default/files/viwiredozilopuvotudulufez.pdf
    • https://www.jsif.org/sites/default/files/webform/kedoruxanagavapiwo.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/47147916176.pdf
    • https://www.jsif.org/sites/default/files/webform/meratasadif.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/34904816646.pdf
    • http://www.pbttphtk.gov.my/sites/default/files/webform/73261430544.pdf
    • https://ambrose.edu/sites/default/files/webform/kepasibadugemefobovabo.pdf
    • https://www.jts.org.jo/sites/default/files/webform/96043924660.pdf
    • http://www.pacificsportfraservalley.com/sites/default/files/webform/90877516301.pdf
    • http://www.friendlycc.com/sites/default/files/webform/fajabenofedutetigolexid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=motorola+mc9090-g+user+manual
    • https://printandmail.princeton.edu/system/files/webform/21338807989.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd0b.bin
bdd6d8aba35d5a6dfb426065c38e99919513cdd6c1ffc69e69bad95229d9d8cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0B 5456 bytes

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