Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebef08f3ae7fc752…

MALICIOUS

PDF

80.5 KB Created: 2021-02-23 17:01:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 27d6001d21056552292ec1bd4357a0db SHA-1: 96014141f623cd34d263faa9d855d9e964d0e322 SHA-256: ebef08f3ae7fc7529746ff220414203f8ab858363c891abc1613ff4aff5cecad
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to 'jacksth.ru/strik', suggesting a phishing or redirection attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is part of a link farm hosted on disposable domains, likely to obscure the true malicious destination. No scripts were extracted, but the presence of external URIs and the link farm heuristic strongly suggest a phishing or credential harvesting attack.

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 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://jacksth.ru/strik?utm_term=what+kind+of+beans+have+low+carbs PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413227/normal_6000d93b7cad0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428329/normal_60091400946b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393761/normal_5feb1cada38c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421957/normal_602405bae51ae.pdfIn PDF document text
    • https://vejikawotepux.weebly.com/uploads/1/3/4/8/134887167/9049728.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424026/normal_5fde4934c33d6.pdfIn PDF document text
    • https://namowabe.weebly.com/uploads/1/3/4/0/134000139/vatalikarimurixevi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459036/normal_60146c02e4892.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377931/normal_5fccd27a5f966.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450724/normal_600ddaed7e2dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374175/normal_6034cb1b960b4.pdfIn PDF document text
    • https://lijimoxa.weebly.com/uploads/1/3/0/9/130969704/wuzeber_pugebov_xesekarega.pdfIn PDF document text
    • https://jitoxegewizo.weebly.com/uploads/1/3/4/4/134460998/zumifejozagimevoxur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474218/normal_5fcaea8957dd1.pdfIn PDF document text
    • https://fezowekufeda.weebly.com/uploads/1/3/3/9/133999429/eaccc67c356c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458144/normal_60198c5d885c0.pdfIn PDF document text
    • https://cdn.sqhk.co/totudavomud/Xgd96ji/lakorofe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF144 5268 bytes
SHA-256: acd1f39e59ea9d58d288309c5310997cd5cb83cad91a5e1c9ed4e01c150ed511
font_01_sfnt_off0001033a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033A 10316 bytes
SHA-256: 837195dabcdd567f5096ed35db8440e8efc30b12e4b9e4afa311a532caa415b6
font_02_sfnt_off0001265f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265F 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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