Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e0e6d577f1e6e0…

MALICIOUS

PDF

78.1 KB Created: 2021-03-04 02:45:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: de34578e29d887590b989d2250da2687 SHA-1: 3b01d5b3c85956028987aee3c0bad7cf94c75bfe SHA-256: f8e0e6d577f1e6e0f4e908a5f0313838240994a0cf30202c188d768d9908df7a
166 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a link farm and a lure for browser extension installation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a social engineering attack aiming to trick users into downloading and executing further malicious content, potentially via JavaScript exploits within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://soxebez.ru/award?keyword=systems+engineering+and+analysis+5th+edition PDF link annotation
    • https://cdn.sqhk.co/gixelotopa/chaheYX/download_chrome_extension_free.pdfIn PDF document text
    • https://gedepaxu.weebly.com/uploads/1/3/1/3/131378821/litoneligot.pdfIn PDF document text
    • https://jesepivop.weebly.com/uploads/1/3/1/4/131483445/1326049.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418167/normal_5fcebe1266f16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494891/normal_5fe9c87e112cf.pdfIn PDF document text
    • https://cdn.sqhk.co/sodelaranu/Figjjii/skylanders_superchargers_racing.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370068/normal_600980e66da2e.pdfIn PDF document text
    • https://cdn.sqhk.co/junizafuzep/R35G7YO/72137081486.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468531/normal_5ffe6f242f857.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://jasuwoxitagani.rf.gd/graduate_schools_are_waiving_gre_requirements_for_2020.pdfIn PDF document text
    • http://punexowimuseva.epizy.com/biographical_information_blank.pdfIn PDF document text
    • http://puwojewemuxa.epizy.com/top_betting_tips_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/converting_fraction_to_percent_word_problems_worksheet.pdfIn PDF document text
    • http://wubonaxe.epizy.com/university_of_michigan_sat_score_report.pdfIn PDF document text
    • http://mavexewaxomem.rf.gd/animation_themed_powerpoint_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/wowugaxemebusowujolesuja.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/bully_anniversary_edition_full_apk_obb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE800 5356 bytes
SHA-256: 6aba6b16663924af3ba541abac688f510be013df5ef862d896384683cb6f9742
font_01_sfnt_off0000f9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FE 10312 bytes
SHA-256: 8dfc1c0356ab9d34fd5aafa7ba54eee999fa1885db7c991c2d2e450617ec1dfe
font_02_sfnt_off00011d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D03 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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