Malicious PDF — malware analysis report

Static analysis result for SHA-256 8496f58591b54d46…

MALICIOUS

PDF

98.6 KB Created: 2021-04-03 04:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: af982b340dc2f441fcdd316cda10615f SHA-1: 264a96a7f599bd329761999419b8802203e23c89 SHA-256: 8496f58591b54d4624a320b1c1a9889f2153c87c903b310b2244a8c72a1577ce
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, and heuristic analysis indicates it functions as a link farm on disposable hosting. ClamAV detection and ML classification confirm its malicious nature, specifically flagging it as a phishing trojan. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

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://xajibur.ru/award?keyword=los+acadios+pdf PDF link annotation
    • http://tipijijajofupi.sportsontheweb.net/24174768890.pdfIn PDF document text
    • http://lnstagramcentre.net/best_brick_rocket_stove_designbu5aw.pdfIn PDF document text
    • http://loduwij.scienceontheweb.net/19529123686.pdfIn PDF document text
    • http://bodyita.space/edexcel_functional_skills_maths_reform9t0j0.pdfIn PDF document text
    • http://grandov.pro/hi_point_9mm_rifle_reviewtyrt6.pdfIn PDF document text
    • http://f13x.xyz/828359358644ig2c.pdfIn PDF document text
    • https://fofapisobav.weebly.com/uploads/1/3/4/7/134712410/jadekudapokan.pdfIn PDF document text
    • https://tulopudegiwidal.weebly.com/uploads/1/3/0/7/130739196/f51917.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/8bdf36fb-0906-4033-8378-e445bb0cb4d2/23556034944.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/sql_server_management_studio_community_edition.pdfIn PDF document text
    • https://e966359d-176b-477a-9ad9-c314bea94227.filesusr.com/ugd/fa6f14_378dbe8345374c6e893d370f859e8833.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d1d8c16-9cab-4bb4-9799-66759b17a93b/bob_ironman_stroller_replacement_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb01fd54-5532-4f04-baa6-3f28b3d3832f/jaxulumiburajewitudejop.pdfIn PDF document text
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_53bfd76db06147a99d6320002e20bb53.pdf?index=trueIn PDF document text
    • https://3175e58c-9db9-4d87-bcb9-15e03531d93d.filesusr.com/ugd/c93210_e2843d7f228943fcbc7f0a1763dbda8d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/rolalelelupezilor.pdfIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_cbacac86a84a4bce94202eff77ade894.pdf?index=trueIn 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_off00013ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFC 4964 bytes
SHA-256: 082232039696203763d610a7205aea750aa14e3576b2e7c1d3acca159c9c50a8
font_01_sfnt_off000150fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150FC 14072 bytes
SHA-256: 11403c0bfa11d9a9fba5a1a1240809ef5dfa2f8d690f43adfbfb51ce2c05d265

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