Malicious PDF — malware analysis report

Static analysis result for SHA-256 964df4a504fc2971…

MALICIOUS

PDF

67.6 KB Created: 2020-11-26 01:13:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 0990d2ac41e2e93ae37fdefc8bfdd1e9 SHA-1: 90c88637b6a4a31c8a8920dd2efccf31b44c0fc5 SHA-256: 964df4a504fc2971c6dd67222c88a8586ddf7e1a017a1884d41d3f74e9da929a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffe.ru/strik?utm_term=latin+perfect+tense+verb+endings PDF link annotation
    • https://kadutazufe.weebly.com/uploads/1/3/4/6/134639852/tuvojiva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448539/normal_5fb50201eb33e.pdfIn PDF document text
    • https://niweduval.weebly.com/uploads/1/3/4/3/134349673/5493000.pdfIn PDF document text
    • https://xotuwajugi.weebly.com/uploads/1/3/4/3/134349857/4849094.pdfIn PDF document text
    • https://relogeseji.weebly.com/uploads/1/3/0/7/130739887/bexilibizixeba.pdfIn PDF document text
    • https://labuxodapiju.weebly.com/uploads/1/3/4/4/134492440/10a8e0c04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401692/normal_5f918bdbf11dc.pdfIn PDF document text
    • https://nezijolumuka.weebly.com/uploads/1/3/4/0/134016970/1068730.pdfIn PDF document text
    • https://fudukonuxevefez.weebly.com/uploads/1/3/4/6/134606022/3789680.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/norozovijalu/upper_gastrointestinal_bleeding_nice_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/pojumagamilemiwowovuzilaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c58003c-c82a-4dd0-9fa6-5d26a60c5655/world_war_1_study_guide_with_questions.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_off0000c83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83C 5432 bytes
SHA-256: 75be18eade56a6885a13156291e18bfb2d351f3af2e35581a400edd66262231e
font_01_sfnt_off0000dacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACC 11308 bytes
SHA-256: 5b27a37a0c9bf1a0c62d3d0da559afec4cd3fac009495084603ae42f090cfcea

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