Malicious PDF — malware analysis report

Static analysis result for SHA-256 91624b15abd2431a…

MALICIOUS

PDF

65.8 KB Created: 2020-11-19 02:03:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f559aa53dde273d665fde5960796e38a SHA-1: 7f5c5d74daa5a0dda593b1744c3456b5a96c7cf2 SHA-256: 91624b15abd2431a8f1a05e9ca3a9d7cd6a769072ff5366fc2c13b494fa112cb
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, which is a common tactic for phishing or SEO abuse. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as phishing. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs suggest an attempt to redirect the user to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/strik?utm_term=dan+c+holloway PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466379/normal_5faab5487330d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407818/normal_5fb45cf6805cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369769/normal_5f917dd268ceb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368475/normal_5f9737d8e2a36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392661/normal_5f8eeb16b437b.pdfIn PDF document text
    • https://mujubafajereked.weebly.com/uploads/1/3/4/5/134595908/038538bfa60255e.pdfIn PDF document text
    • https://tevirilozarenov.weebly.com/uploads/1/3/2/6/132695732/dapix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366331/normal_5f9f5a701968f.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/zuguvoxoki/zisasilakufokawul.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/99870420137.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c279a1e3-63d3-42ee-9a67-5afdbb5958c2/talijitis.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_off0000c47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47A 4808 bytes
SHA-256: d26238edbcba9db1d98098309de878e8e0c353bda70f561cf452f8cf0d9697ba
font_01_sfnt_off0000d4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F3 11404 bytes
SHA-256: b8d7d9c1bf9aaca1f92bec4cddc293953519b45ae4ae2f8d17506c2fb23a9827

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