Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa75b95376f5ee1a…

MALICIOUS

PDF

72.2 KB Created: 2020-11-18 05:05:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1411cf115404dbcd18b7bd5aac35b43a SHA-1: 97297f53ad2cd4d520f83185394db021c9b3cb49 SHA-256: fa75b95376f5ee1a1e1df1e7f96e7ad9e91d2c6b0d691708a2dd7ab81b532b63
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users to potentially harmful sites. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or link-farming attack vector, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=flexible+seating+wobble+chairs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378834/normal_5fa0573e78391.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421957/normal_5f977636d0ffe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454287/normal_5faf4b4b17b25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379723/normal_5f8a6bd4cc649.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415065/normal_5fada50c23091.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479436/normal_5fb4872381bc6.pdfIn PDF document text
    • https://kukezuleji.weebly.com/uploads/1/3/4/3/134361302/kadimodaliroleg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414334/normal_5f98cd3dbe914.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389084/normal_5f8e7b475b0cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374002/normal_5fabd20189adf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1905c16b-565d-4008-9c4e-7f7a33da9b61/midway_monsters_prize_wheel_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0423a20e-3b5f-4100-a4c0-3f1f74454f1f/bepovuvipapok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/146b0bd9-551f-4e2f-9521-e76fefa5a5d8/kajosoto.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_off0000dd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD28 5316 bytes
SHA-256: 19a1dbd820e4bebbe80f82f76d1386c833129ddbb014db91cb71d6e303261adf
font_01_sfnt_off0000ef53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF53 10780 bytes
SHA-256: 0179fdad5f8c99bc4f24f49ec984b5e126454bceb0ddeebd371ebfa1877a24b0

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