Malicious PDF — malware analysis report

Static analysis result for SHA-256 b903c40d252edf67…

MALICIOUS

PDF

87.5 KB Created: 2021-03-15 21:54:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ded4821a65aa0d1c16e02bd8c0721c44 SHA-1: 2817a31bca56ab4af95d02b2713ee93245e846aa SHA-256: b903c40d252edf677c02fa8f464fd4a81709e634f998ce41195173cfd24868ce
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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/award?keyword=chromatography+calculations+pdf PDF link annotation
    • http://tokepubex.getenjoyment.net/59851235273.pdfIn PDF document text
    • https://xixemoxutosiseg.weebly.com/uploads/1/3/4/4/134473276/xoparixibalitadol.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/buzicGf/jezevixo.pdfIn PDF document text
    • http://zizaburixakog.iblogger.org/adobe_photoshop_7._0_makeup_filter_free.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/gkZbUjg/tagojasibike.pdfIn PDF document text
    • https://balusapox.weebly.com/uploads/1/3/1/3/131380564/282db725f47ec.pdfIn PDF document text
    • http://penaleduduzib.iblogger.org/agneepath_movie_openload.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/dijhbha/35851635125.pdfIn PDF document text
    • https://cdn.sqhk.co/maduzonuxoke/iRgfZJz/vabififijegilabosoninu.pdfIn PDF document text
    • http://tumuduwaju.mypressonline.com/kino_cinemax_nitra_program.pdfIn PDF document text
    • http://kozidozilujivox.getenjoyment.net/xudadizagivojaxoporulawi.pdfIn PDF document text
    • https://mejotowud.weebly.com/uploads/1/3/0/9/130969644/meforu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuvuzonixo.onlinewebshop.net/shimano_dura_ace_9150_di2_adjustment.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/amazon_prime_video_watch_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/wulafazitupuzatefuk.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/agazian_movement.pdfIn PDF document text
    • http://pixafur.atwebpages.com/17967299295.pdfIn PDF document text
    • http://tavixemurivadol.rf.gd/how_do_you_factory_reset_a_dell_venue_8_pro.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/22799535206.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/chambers_of_commerce_extended_health_form.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F8 5576 bytes
SHA-256: dfda1bf366d39d9d8c5ee6471d1ff3cd1bab7c7a52b9a519458b699c80fa1b03
font_01_sfnt_off00012ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC7 11176 bytes
SHA-256: 216815a565867f2b66af0206acb8c78ed89e8687fe3655f91ed7cd5fc1d71b13