Malicious PDF — malware analysis report

Static analysis result for SHA-256 6646d3e34610bbff…

MALICIOUS

PDF

67.8 KB Created: 2020-12-02 13:51:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 79bef9d03c50c3b0c92cffc72bd67d44 SHA-1: 2d2fc31dbacd9257845a2fcd4609698330a99590 SHA-256: 6646d3e34610bbffa0827473f004e66abf5c1824287acaa0724f129db13979e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to S3 buckets and other file-hosting services, suggesting a link farm or SEO poisoning tactic. The primary malicious URL identified is traffset.ru, which is likely used to distribute further payloads or conduct phishing. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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://traffset.ru/strik?utm_term=sign+language+for+sorry+i%2527m+deaf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464068/normal_5fa9b8b05c47a.pdfIn PDF document text
    • https://neburaguvud.weebly.com/uploads/1/3/4/4/134477844/20e1307197f2ac3.pdfIn PDF document text
    • https://suludizivot.weebly.com/uploads/1/3/1/3/131383823/torifumuduk-jovopiti.pdfIn PDF document text
    • https://tazesarazuf.weebly.com/uploads/1/3/4/7/134726557/1118740.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/somamere/43913319774.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/469110ae-ff94-4139-bb8e-281db49c1569/tomilugigi.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/11211193589.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/79031579178.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/34946874505.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fa815b4-f6ad-4efb-b40c-84fb025e5507/45133489189.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf62c64a3cc4058a3f39d/1606219311537/tojurakukopubelusofore.pdfIn 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_off0000cb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5D 5468 bytes
SHA-256: 50bffeb79b0732dc0a16477345526b2477148488f19e9a3a57b86c29e2771901
font_01_sfnt_off0000dded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDED 10688 bytes
SHA-256: fd0e9e8377f431bc303464a5ae7df78fa1643f85a2532834ef76b44ec8cfa242

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