Malicious PDF — malware analysis report

Static analysis result for SHA-256 91188e8133788aa2…

MALICIOUS

PDF

71.0 KB Created: 2021-02-27 15:00:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 500e29dacfe2eaadd92ffa1ac643a784 SHA-1: b58b9bdf1aac36b18c834c55eac0f4e60b687d31 SHA-256: 91188e8133788aa286f744bad2a5eac3c60cd9e3be4b7022693846c707d50415
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document attempts to trick the user into installing malicious browser extensions or updates. The presence of numerous external links, many pointing to PDF files on file-sharing services, indicates a link farm designed to distribute malware or phish for credentials. No scripts were extracted, but the overall structure and heuristics point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://xezojetit.ru/wix?keyword=is+230+queens
    • https://bimufoju.weebly.com/uploads/1/3/4/3/134311804/7b0396.pdf
    • https://cdn.sqhk.co/pebekaja/UzMkid7/pokeg.pdf
    • https://cdn-cms.f-static.net/uploads/4387919/normal_6022a0d3b7cbc.pdf
    • https://wijejotuxaketuv.weebly.com/uploads/1/3/4/3/134338978/mifewinu.pdf
    • https://cdn.sqhk.co/fedefuxu/gfhgXOY/snake_cube_puzzle_heart.pdf
    • https://xateboduf.weebly.com/uploads/1/3/1/4/131483383/a3b1e5e696bdf.pdf
    • https://fejoburu.weebly.com/uploads/1/3/0/8/130813906/fufupararofakem_bilevesamusupuj_kovovow_zufitenez.pdf
    • http://zalofamanaw.22web.org/amanush_bengali_movie_720p.pdf
    • https://ginubeputugexow.weebly.com/uploads/1/3/0/7/130738710/sopejagejopuf-kojifojuzaku-dejuzozozipodu-rizafolatona.pdf
    • https://mitojebani.weebly.com/uploads/1/3/2/7/132711961/botol.pdf
    • https://tewukowil.weebly.com/uploads/1/3/2/7/132741555/lajeroparokut_dedazegovukojel_zufikatanege_sizosare.pdf
    • https://xizuzumuk.weebly.com/uploads/1/3/2/6/132682261/vegulaviwumawat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tatuzukokamowa.rf.gd/delofusowevofukotuxas.pdf
    • https://s3.amazonaws.com/vebenok/78030834584.pdf
    • https://s3.amazonaws.com/rodakarugupoko/latuvasekepud.pdf
    • https://s3.amazonaws.com/kudowo/transformational_geometry_worksheets_grade_7.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_off0000db24.bin
c445e26a458a336e4c94a0775c137416a0f895ecfb247d7a9feacf96cfbc10e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB24 4840 bytes
font_01_sfnt_off0000ebbb.bin
f3e3c2f647aab3a7a6716d669d5b37e5bb6701f787d371e6c6289e7818e2b654		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBB 10472 bytes

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