Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb320ec7d87f6f96…

MALICIOUS

PDF

80.2 KB Created: 2021-04-17 03:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e74693bde67ab1315e12a06be0351d9 SHA-1: e2e3013d758f713307b05c52b1604e65ddb5eb7a SHA-256: bb320ec7d87f6f96a63c891e3ee87fe151610f9ab044fae4c66e793f1d24975b
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to disposable or unknown domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7573

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.grotekeukens.be/sites/default/files/webform/gmawards2018/31843799141.pdf
    • https://www.jwico.com/sites/default/files/webform/23528315583.pdf
    • https://www.blplegal.com/sites/default/files/webform/89971565628.pdf
    • https://www.natsihwa.org.au/sites/default/files/webform/81826716543.pdf
    • https://ambrose.edu/sites/default/files/webform/nakevatekiviva.pdf
    • https://ambrose.edu/sites/default/files/webform/gewematumupam.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/25507329945.pdf
    • https://www.cdcplumbing.com/sites/default/files/webform/contact-us/sawifujemenolezaf.pdf
    • https://www.jsif.org/sites/default/files/webform/94808830073.pdf
    • https://www.mothercare.ro/sites/default/files/webform/resumes/jevosofotabotasif.pdf
    • http://www.friendlycc.com/sites/default/files/webform/mitiporaju.pdf
    • https://ambrose.edu/sites/default/files/webform/58234525485.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=what+are+the+first+second+third+and+fourth+estates
    • https://community.princeton.edu/system/files/webform/22535495660.pdf
    • https://ubmemeaensoprod.s3.amazonaws.com/ifsec_international/call_for_papers/2021/03/kizoromafogikigogusebef.pdf
    • https://gradfutures.princeton.edu/system/files/webform/fumegefexuwonadijot.pdf

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