Malicious PDF — malware analysis report

Static analysis result for SHA-256 89198c81fa718090…

MALICIOUS

PDF

99.3 KB Created: 2021-03-31 16:41:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa3cf16ba997d120a9a58c2155f97da5 SHA-1: ea75c27d5158c9b40c7032046eeaf5934351b9bd SHA-256: 89198c81fa7180909a1a8a4fccb0fc98aeb53a5faae9ddf324697a0bbc84288d
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit users through deceptive content.

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://bologen.ru/award?keyword=introdu%25C3%25A7%25C3%25A3o+ao+budismo+pdf+gratis
    • http://deemonatrafik.xyz/hardest_climb_quotest5t79.pdf
    • http://kimidenexikox.getenjoyment.net/44323000661.pdf
    • https://cdn.sqhk.co/kokuxisa/1EhhLLV/dusurujorenatunetezuxu.pdf
    • http://wejaduz.mypressonline.com/pdf_capitalismo_e_liberdade.pdf
    • https://kenafowipadile.weebly.com/uploads/1/3/1/4/131437871/tisusagiv.pdf
    • https://cdn.sqhk.co/kivipemo/CsqibHb/duzibadufefubonatamarukez.pdf
    • http://bottlechainworld.com/high_school_admission_essay_examples_about_yourselfc55tv.pdf
    • https://cdn.sqhk.co/nopawuwam/ciauRKm/harvest_market_fort_bragg_bakery.pdf
    • http://shoplus.info/rotatinopanawixapiruznn0ru.pdf
    • http://1-bog.ru/meritadamxjr0s.pdf
    • https://kibirurifawejax.weebly.com/uploads/1/3/4/6/134610443/9c7886.pdf
    • https://cdn.sqhk.co/ribobujir/eRliej7/epson_iprint_pour_windows_7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sezewu/sokakajenidotewojumulu.pdf
    • https://s3.amazonaws.com/wixamupelinere/formation_agent_gnral_d_assurance_axa.pdf
    • https://s3.amazonaws.com/naxozelozude/why_does_my_health_o_meter_scale_says_lo.pdf
    • https://s3.amazonaws.com/defujo/jetakisuwam.pdf
    • https://s3.amazonaws.com/gajakelegeza/30513889798.pdf
    • https://s3.amazonaws.com/lolaritemukole/tafilujetefinibenosufal.pdf
    • https://s3.amazonaws.com/vinivuxo/33172337218.pdf
    • https://s3.amazonaws.com/xunilukegez/vsco_hack_all_filters_unlocked_apk.pdf
    • https://s3.amazonaws.com/nisoxow/kuwefidaburoromovekekugo.pdf
    • https://s3.amazonaws.com/marimejerebo/93857393316.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_off00013c0e.bin
5c6367a55e9e3abd001abae5cf40766ecbd4076102c0c164c14419ed313292ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C0E 5904 bytes
font_01_sfnt_off00014f7c.bin
b929929dcf724879baf92fd100db5fc0de7ebf96c337e1db6f2d7fe07116178f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F7C 16204 bytes

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