Malicious PDF — malware analysis report

Static analysis result for SHA-256 790ad3834cb5dbca…

MALICIOUS

PDF

76.3 KB Created: 2021-04-07 10:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7fe0570430070f986d1520f0a93235f8 SHA-1: 710cf3ea460cfa6b101959aaf79e2ba2c734225d SHA-256: 790ad3834cb5dbcacacfc1566af64a75b6f2a1fa8b167f241d15150f36165a43
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/123?utm_term=bayah+di+anpadh+hari+te+ringtone
    • http://onkoprofi.ru/jesosatawixufofinomewijadq8ajc.pdf
    • http://circus.market/51723149591he2ux.pdf
    • http://wamuwosola.mygamesonline.org/les_miserables_broadway_2014_cast_recording.pdf
    • http://vajesafosedepur.mywebcommunity.org/introducing_autodesk_maya_2020.pdf
    • http://pollsexpert.com/galis0hxt4.pdf
    • https://cdn.sqhk.co/komajekolino/gfhagcR/79302382155.pdf
    • https://cdn.sqhk.co/dizoketa/f1ifign/metro_last_light_how_to_throw_knives_ps4.pdf
    • http://kernig.online/zixakutimuth1izy.pdf
    • http://sozawakofuriwoj.getenjoyment.net/social_administration_definition.pdf
    • http://artdebug.site/897949004939l6as.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_1f2aa72b70f44a918267dd5785e77cc1.pdf?index=true
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_759e0b6b3f8e4d0187e8304377e2e883.pdf?index=true
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_e056f3b0c0184bd6b8099351ec0c5ec0.pdf?index=true
    • http://wenibeliso.atwebpages.com/access_point_toronto_application.pdf
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_a6ffcd84ee034a6a9b06829a07b894a4.pdf?index=true
    • https://c83cbd6e-a134-4b49-ba12-49f24c654ad9.filesusr.com/ugd/904a8b_42fab3e727624a4e85e9e59c3b785cb0.pdf?index=true
    • https://4a5bfc55-71df-4474-8f3e-9f6aca65c64b.filesusr.com/ugd/29b6ce_c124076382b94561bc010d06a3124b20.pdf?index=true
    • http://poborunedajemo.onlinewebshop.net/100_job_interview_questions_and_answers.pdf
    • https://86b7bb9a-6a0b-496c-a062-e8aa60c365d0.filesusr.com/ugd/dcf311_35fa06863cf44212acbdc8c04c477d27.pdf?index=true
    • http://sifebitufol.onlinewebshop.net/54936607408.pdf
    • https://e86c6366-0652-46cb-9e1f-5633a133dba9.filesusr.com/ugd/510a18_f4194d799a8d448db533910fadef7cb2.pdf?index=true
    • http://majezomisi.myartsonline.com/lufowedupogi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecb7.bin
e45a4e035aadda02cda9c4ef8705a95ab8a9ac641fdede4f855ac96f65c9b719		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECB7 5160 bytes
font_01_sfnt_off0000fe4a.bin
b262ed9258faca8b4d1b14578cc88e1ab5a9663673f78b2b6bcf452515c58412		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4A 11424 bytes

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