Malicious PDF — malware analysis report

Static analysis result for SHA-256 e704af2401b47976…

MALICIOUS

PDF

73.7 KB Created: 2020-12-26 22:08:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7327b4883dedd5054cba8136efa2f58e SHA-1: 8109c87f7249696f42a113e9af8b7e329506718a SHA-256: e704af2401b479764abdbf6a9d55b15c941bc1d6af7944a95f9e553711073ce3
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with critical heuristics indicating it's a malicious redirector and part of a link farm. The ML classifier and ClamAV detection strongly support maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, potentially for phishing or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/wb?keyword=hola%20music%20guitar%20lessons In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370309/normal_5fd67c2d10eb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365621/normal_5f89f95f3f4c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393489/normal_5fe2ce0cee52b.pdfIn PDF document text
    • https://nemegadixutore.weebly.com/uploads/1/3/4/6/134689972/e22c383a279.pdfIn PDF document text
    • https://wabemogulumog.weebly.com/uploads/1/3/4/3/134384503/aa60ac8e941.pdfIn PDF document text
    • https://kunoloxudiruk.weebly.com/uploads/1/3/4/7/134767428/1050212.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418991/normal_5fad49f7c0e8c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1f0488c-ec76-4986-9b79-d1581888697b/betojoxinivejeru.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/pugiwizikurovepivuvune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6be80645-f736-49c1-b7b9-2caeb67bc2b9/sarifabazozovofusenigagag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49d62f84-2fdb-48ba-8eae-145657756541/freight_train_tab_songsterr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0261c70-129b-46ca-881d-761a1a5a6cb8/30307492704.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_off0000e578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE578 5080 bytes
SHA-256: 149cd0a4d8a4a4c6ab26c4c50233022c655ebe2510adcd795f8f581927d4d9fa
font_01_sfnt_off0000f6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A7 10392 bytes
SHA-256: 009ca55c34c973ec0d21d5bcb96409d48b466bdc3215366fa550785b1be519dd

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