Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af25cf26f43d00e…

MALICIOUS

PDF

71.2 KB Created: 2020-11-25 10:12:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c06dfb561f8460387b845788ed841650 SHA-1: 7521d937e4563bcc258e21d0384cce135eea3c6d SHA-256: 4af25cf26f43d00ed1816e5c73ade8e89c5c20ccd20e4163ce85de6bf6d916e3
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a heuristic firing for a link farm, directing users to a suspicious URL. ClamAV also detected it as a phishing trojan. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

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=chaos+rings+apk+reddit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464078/normal_5fa5347444366.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381318/normal_5f98f0949aa15.pdfIn PDF document text
    • https://poxotedodesogin.weebly.com/uploads/1/3/4/3/134305686/pepafenezewojumode.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481831/normal_5fafd69a57a68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380692/normal_5f9f92d27892d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370077/normal_5f8f1a3f540bb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/879507d7-ef75-4ce9-b343-ffcf7dbcb916/63203523352.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6dab259-2ec5-4ca8-99a8-bcbf71b5ff6e/gonuzimalerojovikela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6da833b8-2e58-4a85-874c-b9ad68a23822/mythology_lesson_plans_middle_school.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/niludarodosufivonimugijux.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/kutum_vs_nouver_on_witch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b7818ac-a97f-4e15-a087-d2a988ee9a10/17443238309.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/870f1436-e15d-470c-84fb-965014ddc13a/86915407949.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD71 5064 bytes
SHA-256: 246a94b2fb0fa3cf3993281645bf371be254ac49d6299fd378cfe0375303f45e
font_01_sfnt_off0000dea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA4 10380 bytes
SHA-256: ce6c6f516fafc0c53808ee499500fec8e5f1a61f25e66bd78a956079d5c8b9c0
font_02_sfnt_off0001020e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020E 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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