Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e9a27679df4fed…

MALICIOUS

PDF

71.2 KB Created: 2020-11-22 19:55:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 0d450810d2196495982eb4cb4cc2bacb SHA-1: b8ce9f3e7dbe5ea8ff842b2306e1e5357783dfe2 SHA-256: c9e9a27679df4fed79e1a6c8e513319b5c43734343f8a3cd41ad2a796ff50af9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used in SEO poisoning or link farm attacks to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites or download further payloads.

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://trafffe.ru/123?utm_term=controversies+in+contemporary+advertising+2nd+edition+pdf PDF link annotation
    • https://loponulofaxoli.weebly.com/uploads/1/3/4/3/134324484/b8e6935e40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420604/normal_5fa12579daa40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393483/normal_5f95d8b415245.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404983/normal_5f9377a7cdbb6.pdfIn PDF document text
    • https://zorisurirumu.weebly.com/uploads/1/3/4/6/134600588/tomunir-sewaxeloledap-zolarukok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393776/normal_5f939c6989c79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367624/normal_5f87583f7ff95.pdfIn PDF document text
    • https://nobozufale.weebly.com/uploads/1/3/4/3/134322784/2452508.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383467/normal_5f994488e83fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408461/normal_5fb80dcbc1214.pdfIn PDF document text
    • https://kukutapiroboj.weebly.com/uploads/1/3/4/7/134712573/679f7.pdfIn PDF document text
    • https://pisanofinupu.weebly.com/uploads/1/3/1/4/131437881/b30e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384817/normal_5f9450253a1bd.pdfIn PDF document text
    • https://nobaditidiz.weebly.com/uploads/1/3/4/2/134235496/sorediba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471509/normal_5fa64d498ac65.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD776 5640 bytes
SHA-256: ef86c5baf099e4b79c46a4777ef1c8a85985c748dfe27feeaa35c83f0342521f
font_01_sfnt_off0000eaa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA5 10908 bytes
SHA-256: ae42e6aba801e76ea3e8442ee7934ecf3bf1f94fa8f32a804dcd864ad91e229e

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