Malicious PDF — malware analysis report

Static analysis result for SHA-256 9676bbeed75ff2f4…

MALICIOUS

PDF

73.6 KB Created: 2021-04-03 16:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5c46e1ca8f38e2c02a739fbc2a9c95f SHA-1: 6905a98656c4b4233e726e2e29c3b9c0cb5077bd SHA-256: 9676bbeed75ff2f473c8c4776a307f174a67e7d0774752bb6d7b14946e9b420e
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, vilenefex.ru, which is likely used to host malicious content or facilitate phishing. The document body, though heavily obfuscated, suggests a lure related to 'school absent letter writing'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/wix?keyword=school+absent+letter+writing
    • https://cdn-cms.f-static.net/uploads/4366302/normal_602cf9ba37ed7.pdf
    • https://cdn.sqhk.co/parikozug/fCUajea/parrot_wallpaper_hd_3d.pdf
    • https://cdn-cms.f-static.net/uploads/4529697/normal_60511bfb803d5.pdf
    • https://cdn.sqhk.co/wovenebi/hN6KNSm/metal_fold_up_chairs_for_sale.pdf
    • https://cdn-cms.f-static.net/uploads/4446285/normal_605bfce6771b8.pdf
    • http://excschool.ru/free_alphabet_worksheets_for_3_year_oldsgsnzy.pdf
    • http://starconflict-game.ru/48174596669d9zm9.pdf
    • http://astropsychology.website/vadipesavuzowetusay35ms.pdf
    • http://lavka-karamel.ru/california_parental_leave_eligibilitydolkh.pdf
    • http://all-system7.club/64241486642p4f70.pdf
    • http://gemofesane.medianewsonline.com/fraction_addition_and_subtraction_worksheet.pdf
    • https://cdn.sqhk.co/jawakagufu/kjbfBFF/fexemamalelagiba.pdf
    • http://tepoparupomo.medianewsonline.com/couch_to_5k_running_plan.pdf
    • https://static.s123-cdn-static.com/uploads/4388165/normal_600367f123fea.pdf
    • http://netewe9.xyz/15660675639hzoex.pdf
    • http://reduslim-italiaufficiale.site/ielts_writing_task_1_pie_chartrfysn.pdf
    • https://cdn.sqhk.co/nozelenid/a6ig5he/wogofivopogojogubavunoke.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/883dc288-5a07-4a2c-ac8e-79fe9a1d20f3/guvomodegitageluderot.pdf
    • https://uploads.strikinglycdn.com/files/1c5b677a-beea-4be0-ad0e-f3ee5cf14b34/60935929394.pdf
    • https://uploads.strikinglycdn.com/files/4c38febe-3a7c-48f6-8911-2e2d185dd391/2021_lexus_is_300_0-60.pdf
    • https://uploads.strikinglycdn.com/files/dd084b0f-e1ec-404b-a264-1ebf249bedab/79736993049.pdf
    • http://kigokigaruv.myartsonline.com/79832310814.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_off0000e2c4.bin
39b9b71eaacd44c08983dfa61c72f0b2aa92762c3f07e25b44a9a2e954f17d6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C4 5396 bytes
font_01_sfnt_off0000f528.bin
9cfe6e487c9f7a96461a33dc61a43bcca6db21f864be829fa9a202f95293559e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF528 10624 bytes

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