Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a9272a65625a20…

MALICIOUS

PDF

73.7 KB Created: 2020-11-19 17:10:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: cfa5c950c0c16821ac643da9f8958c5c SHA-1: 4f8abb26554d9f40f24b27730cb2619e0a57feea SHA-256: d7a9272a65625a20b686bc06fa4f83b6ec33e2270886231d893f98cb0506ac91
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 for SEO poisoning or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffnew.ru/123?utm_term=solving+similar+triangles+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481999/normal_5fad2dd2311bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379474/normal_5f960496007f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372360/normal_5f8a110c38a59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478148/normal_5fa79a54789f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472484/normal_5fa8d7d6e784f.pdfIn PDF document text
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/gidofokalesifudelo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389365/normal_5f9be17946bd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365638/normal_5fa560b7c373c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369928/normal_5f881336183ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450148/normal_5fae338f45caa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384035/normal_5fb3e45c4f196.pdfIn PDF document text
    • https://naxizugopigonav.weebly.com/uploads/1/3/1/4/131408516/nedav-fukew-jerifolad.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://s3.amazonaws.com/ganubifirigevi/40803930448.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDA 5208 bytes
SHA-256: 20512cfa41e9050f9ea451ae26ba8cd526a421994354f09974884b924be97a47
font_01_sfnt_off0000d169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD169 10692 bytes
SHA-256: 0ace3e074f6b1772f5dfd8caf04ee13044cd39340e8c61d5902a59084abf329f
font_02_sfnt_off0000f63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63E 16208 bytes
SHA-256: c668340ea348c6c31d5e51383644f9376ddb5abab10fc4a31907679951a3ddda
font_03_sfnt_off00010b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8C 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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