Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5d7a7d363a1b05e…

MALICIOUS

PDF

59.9 KB Created: 2021-04-20 16:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f257e6a790005e8524e40edf6485c71 SHA-1: 7ad72ffc8406b656ed07f2305e366991162a78d4 SHA-256: d5d7a7d363a1b05eacfe2da40231afa3495c98e4e56415aef55b8e42d34e8e36
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ML classifiers and ClamAV, with a critical detection score. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are associated with disposable hosting. The PDF document body is heavily obfuscated and unreadable, suggesting it is designed to conceal its malicious intent rather than convey legitimate information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9521

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.dgs-interparts.be/sites/default/files/55949953827.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/keborezuvefubivuw.pdf
    • https://web.liderpapel.com/sites/default/files/webform/xikamiwaboloz.pdf
    • https://ambrose.edu/sites/default/files/webform/71048230710.pdf
    • https://www.dgs-interparts.be/sites/default/files/36138637258.pdf
    • https://aboss.by/sites/default/files/webform/12404161593.pdf
    • https://www.dgs-interparts.be/sites/default/files/41094691834.pdf
    • https://www.afscme65.org/system/files/webform/rerezuduzolorefa.pdf
    • http://www.pbttphtk.gov.my/sites/default/files/webform/74795851198.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=are+weak+acids+nonelectrolytes
    • https://campusrec.princeton.edu/system/files/webform/93394875634.pdf
    • https://www.healthdata.org/sites/default/files/resumes/68382108709.pdf
    • https://www.vub.be/sites/vub/files/webform/piwolumubixu.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d404.bin
debf9c8d0d3a5ecd9a3a6b94644188b535ddd15f8806fd5aa86b5ac907a0faae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD404 5180 bytes

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