Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf27801401d91f74…

MALICIOUS

PDF

49.6 KB Created: 2020-11-13 09:06:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3107075be96dbe95541690d075100f1a SHA-1: 10ca32008ccb7158cf259de2cbca5fed4e139799 SHA-256: cf27801401d91f742b81099acf54e167f5fca4185bc70f76a545bfe283ebbb28
154 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to PDF files hosted on various domains, suggesting a link farm or SEO spam campaign. The ClamAV detection and ML classifier indicate malicious intent, likely to redirect users to phishing sites or download further malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7847

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffi.ru/aws?utm_term=android+10+oppo+f1s
    • https://cdn-cms.f-static.net/uploads/4416316/normal_5f9bdb5a219e1.pdf
    • https://rizenorugeworo.weebly.com/uploads/1/3/4/3/134379336/jizarajajizex-piwodo-nexajijux.pdf
    • https://cdn-cms.f-static.net/uploads/4365661/normal_5fa28cf36cf4e.pdf
    • https://cdn-cms.f-static.net/uploads/4368759/normal_5f88b72e3335c.pdf
    • https://cdn-cms.f-static.net/uploads/4389576/normal_5faad4176537c.pdf
    • https://cdn-cms.f-static.net/uploads/4380395/normal_5f922fc0aac01.pdf
    • https://cdn-cms.f-static.net/uploads/4459805/normal_5fa2115c26502.pdf
    • https://cdn-cms.f-static.net/uploads/4406501/normal_5fa507062a54c.pdf
    • https://loraxero.weebly.com/uploads/1/3/4/3/134332649/7646507.pdf
    • https://poxobavu.weebly.com/uploads/1/3/1/4/131453713/fevutinu.pdf
    • https://cdn-cms.f-static.net/uploads/4365583/normal_5f9196e5eee99.pdf
    • https://cdn-cms.f-static.net/uploads/4381318/normal_5f9b9e871bc55.pdf
    • https://cdn-cms.f-static.net/uploads/4493282/normal_5faddb64b7769.pdf
    • https://gojodisob.weebly.com/uploads/1/3/4/6/134664442/1954024.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pesetufavo/adventist_church_manual_2015.pdf
    • https://s3.amazonaws.com/xanebavifamopez/45257444011.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b825.bin
d257e4abc76e79b9c7282c8a587f78da3f84e8322f067024c7de478f8657a65d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB825 4976 bytes

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