Malicious PDF — malware analysis report

Static analysis result for SHA-256 2347391e3ce1bd87…

MALICIOUS

PDF

75.7 KB Created: 2021-03-22 16:10:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 07682ed1cef07c611822b8a8ff9e180e SHA-1: 70efb9b52b5be4ecb60bb332b3d15534969dd811 SHA-256: 2347391e3ce1bd8795fd04f062c48911448d56223a94ce0cca5fc99d40581b64
126 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous external URIs, including one hosted on disposable infrastructure, suggesting a link farm or redirection mechanism. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate an attempt to redirect users to potentially harmful content.

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://leonvi.ru/award?keyword=business+intelligence+and+analytics+books+pdf PDF link annotation
    • http://xopaberowiwin.getenjoyment.net/atoms_and_molecules_class_9_assignment.pdfIn PDF document text
    • https://labomozojaxige.weebly.com/uploads/1/3/0/7/130738499/76a816.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460070/normal_60422341a84f5.pdfIn PDF document text
    • https://mopotiwifatuge.weebly.com/uploads/1/3/0/8/130813373/wasemu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451929/normal_5ff927df9e33a.pdfIn PDF document text
    • https://gisudilepa.weebly.com/uploads/1/3/5/3/135346020/xatigamimogiduwunevu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421201/normal_5fe4e7c4ce276.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6a9ecc2b-05c3-4056-8705-773ae6be8cdd.filesusr.com/ugd/7a359d_8e016415d98b415d861afe72476d80a2.pdf?index=trueIn PDF document text
    • http://vameberimonon.onlinewebshop.net/bb_t_bank_statement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66e67d54-1f14-4a28-b709-da7a77cfdf62/vegan_side_dishes_for_thanksgiving_dinner.pdfIn PDF document text
    • https://cff07a16-13b2-455b-8a78-148a75b158b4.filesusr.com/ugd/cda0c7_43ba799a86ad4ae68231a611ab13b327.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7df2103c-8a23-4c2a-96fa-038e36b3ae7c/mimurimamuvokimowin.pdfIn PDF document text
    • http://kudawarov.epizy.com/82532361034.pdfIn PDF document text
    • http://wobudesupak.epizy.com/zujajomo.pdfIn PDF document text
    • http://rapuzezu.epizy.com/turn_difficulties_into_opportunities.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb9c585f-0b20-405c-bdde-60cfd4ba4f98/83078849659.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4111bb6a-9d0e-47a8-8f1e-d602910508ef/the_disaster_artist_cast_vs_real.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_off0000e7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F5 5580 bytes
SHA-256: 539e5b36b9f6246a0ae6aa83f915e2b61c9fb95ad062e36df8f038fd1e1af718
font_01_sfnt_off0000fb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1D 11368 bytes
SHA-256: e9ef068e1b962bd94b7dbe59e97ef458c2c3010cd55d2667b95245f541aa8853

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