Malicious PDF — malware analysis report

Static analysis result for SHA-256 2654acc274c29214…

MALICIOUS

PDF

70.1 KB Created: 2020-11-23 23:47:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 13fd3b5c84059be054ebbeeab65a5b12 SHA-1: 295a2195a01dbeaee40cb5277ab389b8bd90ffce SHA-256: 2654acc274c29214858bf9177851c0911c86335a494278150eef0b2bb17ebce6
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to drive traffic to potentially harmful content, aligning with spearphishing or SEO manipulation tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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=pioneer+vsx+1020 PDF link annotation
    • https://josadezabo.weebly.com/uploads/1/3/4/4/134490641/mugegutesuva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366022/normal_5f88cb045d0f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375353/normal_5fa0b281a4fda.pdfIn PDF document text
    • https://rabebazenapaju.weebly.com/uploads/1/3/4/7/134771608/samofomawupep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369796/normal_5f892ff0b6037.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378383/normal_5fad4f63901ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405641/normal_5fb3257bd8466.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391331/normal_5f9673a533f59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365552/normal_5f8faa9f3bc77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385410/normal_5faa32f68070d.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/f5ee1681-8d22-4fd8-8817-d76c1bc7f2d0/pearson_english_interactive_2_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/safawa.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_off0000d523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD523 4892 bytes
SHA-256: 5d846821c2aa34a9576ccc0cf2537c8ea3b9a286a8356dabc6b53e7d56aff828
font_01_sfnt_off0000e5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EA 11188 bytes
SHA-256: 4ae3e6fc369c5a1df5cca1e432bc710afef57b5fb47e820f4d699a6944d85e9b