Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b3bb2023933e51f…

MALICIOUS

PDF

65.7 KB Created: 2020-12-30 18:49:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9c2ac0e50daaf26683c91e259733200b SHA-1: 79f44a9d1481c91d22981e5d3a633df24ad16bbb SHA-256: 3b3bb2023933e51f0b0b436a9604442a8ec0f4c516d1385797c644d406c39c8d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on Weebly and Strikingly, suggesting a link farm or SEO poisoning tactic. The embedded URL and the heuristic firings for PDF_SEO_LINK_FARM and PDF_URI strongly indicate a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection further support the malicious classification.

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://trafftec.ru/123?utm_term=area+code+408+is+located+in+what+state PDF link annotation
    • https://fupobemoxu.weebly.com/uploads/1/3/4/6/134669325/245f56bc1ffe8.pdfIn PDF document text
    • https://pomudada.weebly.com/uploads/1/3/4/3/134382041/30aa8d9c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389804/normal_5f8e0d3d6de3e.pdfIn PDF document text
    • https://genamimiwovem.weebly.com/uploads/1/3/1/6/131636881/tuzozajeruru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428341/normal_5fcf02dfe23a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368248/normal_5fbf2093d7690.pdfIn PDF document text
    • https://dofazodasi.weebly.com/uploads/1/3/0/8/130873943/wulonajagopoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489414/normal_5feb56757e562.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/fccacf38-0566-4ed1-91e9-bbd0b083a5e8/dipper_taco_bell_fic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f55e4eb5-5dfe-43f9-9607-d777f63449ba/73958959774.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40fd10a0-085d-4a58-a701-4fc110fca149/18471593857.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac1b0a9a-9a83-42c4-b6fd-db4f8a111dfb/30546373742.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_off0000c278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC278 5532 bytes
SHA-256: 18f8d762055ae35dfd846ff12004a7cd74b0c4bc788b32b40070c5069548d671
font_01_sfnt_off0000d552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD552 10276 bytes
SHA-256: be77276148aaedf7a4151bf2321a58a6b263e73712fe109ff54d86a7fc8875bc

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