Malicious PDF — malware analysis report

Static analysis result for SHA-256 4791a23bcc1a34d9…

MALICIOUS

PDF

65.1 KB Created: 2020-11-16 16:35:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 81603faae4e3303ddef8306c18dedd16 SHA-1: d091ffcbb78a2a66f0277c10e55c717d52743799 SHA-256: 4791a23bcc1a34d92e9bb50f723d16b93d6b189b666542b6122c4d8c11e1a2af
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or link farm attack. It contains numerous external links, including one to 'traffnew.ru', suggesting an attempt to redirect users to malicious sites or host further malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the 'PDF_SEO_LINK_FARM' heuristic indicate a likely attempt to manipulate search results or distribute malware through linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://traffnew.ru/strik?utm_term=saxo+haynes+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454965/normal_5fa9d15826079.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378151/normal_5f8a4d6eaa3b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383156/normal_5f8d73e8c12d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379054/normal_5fa5737674c55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391621/normal_5f8f3fd7eb01f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368768/normal_5fa257c3665f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_5f8775b3e4eff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383464/normal_5f9c583a71599.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372105/normal_5f99897e7d9fc.pdfIn PDF document text
    • https://sixapinipuso.weebly.com/uploads/1/3/1/3/131384402/3231084.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379363/normal_5f8ecfc6ceb86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410000/normal_5fa4ade0e217e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370051/normal_5f8c9b25099fb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF0 5460 bytes
SHA-256: f91471bf1719efe861d62e8c54eaa072d7e1b1b44af70009801044cddc099357
font_01_sfnt_off0000d16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16D 11632 bytes
SHA-256: e4d04a9da862b959f3b808d2c0ecd220c7f9f5fb94d1775f04a6c6a9afa1df52

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