Malicious PDF — malware analysis report

Static analysis result for SHA-256 caa4c9852fda73c0…

MALICIOUS

PDF

66.0 KB Created: 2020-12-22 23:52:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: af627881f4b8893979f43895d241c8d0 SHA-1: ee3585f6f6ccb4f6efac8dc0c12d88b80c68bd1a SHA-256: caa4c9852fda73c0edd7e14570c198882253dcad4950d3b47cbe3c5123cae0ad
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, a common tactic for creating link farms to manipulate search engine rankings. The primary malicious URL identified is trafffe.ru, which is likely used to redirect users to other sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through the link farm.

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://trafffe.ru/strik?utm_term=stickman+running+sprite+sheet PDF link annotation
    • https://poxemitiwafu.weebly.com/uploads/1/3/1/8/131871555/b00b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453342/normal_5faf9af0c178c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403940/normal_5fb6ed5715c0c.pdfIn PDF document text
    • https://vakogupomuniv.weebly.com/uploads/1/3/4/6/134610568/wabel_serogusidutepi.pdfIn PDF document text
    • https://refapezi.weebly.com/uploads/1/3/4/9/134904673/fawomi.pdfIn PDF document text
    • https://fubabogi.weebly.com/uploads/1/3/4/6/134617409/1736639.pdfIn PDF document text
    • https://ginuwedisifixel.weebly.com/uploads/1/3/4/7/134744372/48781.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/eec2b557-7e61-4044-bc1f-cb1112367909/71895855766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38d2d58c-6056-41a5-aef0-2d4f22c8ba1d/kenmore_500_washing_machine_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87dbdad3-0069-469b-a278-ecb19354e3fb/mosquito_netting_for_patio_doors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/597ccf26-0bd5-48f7-9c95-3eeac0550226/fixaresekiridutaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d082a08c-506a-4aae-ad78-de9142c8f7f0/67727270694.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eb9023c-0bd2-4a24-8a16-d9e5194f10f5/fijababulukuk.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_off0000c2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C2 5480 bytes
SHA-256: 3d1a3c56761377829432d77b7a859f3fd591d2648428c837746a233d256db27d
font_01_sfnt_off0000d540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD540 11736 bytes
SHA-256: a56c135a7d7402128f45e7487f959612d06e5c25d22f703efe6e3c0f1bdb4459

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