Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac82dbeb5ff95fb5…

MALICIOUS

PDF

96.4 KB Created: 2020-12-03 23:47:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 6d08d9109cfebf30f3b857c50732f65c SHA-1: 63fa4243453c79efff8884f0e808caceed226e49 SHA-256: ac82dbeb5ff95fb5898c68b30fffd48281632dd4d87337247901d7655081a5db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, with a critical heuristic identifying a 'PDF_SEO_LINK_FARM' and listing a specific S3 bucket URL. ClamAV also detected the file as 'Pdf.Phishing.Trojan'. The presence of many external links suggests an attempt to redirect users to malicious sites or to host further malicious content, aligning with phishing and exploitation tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/strik?utm_term=how+many+decimal+points+in+a+billion PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366647/normal_5f8752c43e0f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370078/normal_5f8f6966398cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388842/normal_5f927d083f2d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380226/normal_5f8ce569c42ec.pdfIn PDF document text
    • https://nuvefiwepopowu.weebly.com/uploads/1/3/4/5/134502743/xuxepasim-didefotopaf-fogavijupapegop.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/zanadutut_wexudafenatogun_jetomefoja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374002/normal_5fa874e9c93da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445130/normal_5fa66a009c917.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368489/normal_5f8c548466b93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408346/normal_5fa73b0871ffd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450151/normal_5fa05cbeb308b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/nuzixaxoluwirigo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4f9ac15-192d-4aa5-9109-6ae299befdf2/41938491084.pdfIn PDF document text
    • https://s3.amazonaws.com/lopazura/mogipotik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8a787a3-b93a-48dc-8d0b-143af8e9c738/87306814027.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/14097969620.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_off00013a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4F 5420 bytes
SHA-256: 48b1f3900ab27b867fa62ff68c268f8e2749544f5377e2b92464f4c66e4e49a6
font_01_sfnt_off00014cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CB8 11752 bytes
SHA-256: 9e68fb2ccef0bfab94e0d1ac87fc9ceddb7359e3970f27e293e8f7afd6857018

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