Malicious PDF — malware analysis report

Static analysis result for SHA-256 5434afa33a37ef18…

MALICIOUS

PDF

78.0 KB Created: 2021-02-26 23:08:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cf095fcc9fb5f0599b765dd43bc3771 SHA-1: 166f79a8defc4382c868b5e4aa334ea6d7967e53 SHA-256: 5434afa33a37ef18a1a2c5d9030f5ad34676f258534935881a6f48c15d52492f
126 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The primary URL, 'https://midufefew.ru/123?utm_term=brother+mfc+j825dw+printer+offline', suggests a phishing lure related to printer issues. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

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 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://midufefew.ru/123?utm_term=brother+mfc+j825dw+printer+offline
    • http://jedusajinud.mygamesonline.org/nemorafusupazax.pdf
    • http://vevaxogejaz.scienceontheweb.net/ninudo.pdf
    • http://tibagisuminove.sportsontheweb.net/xokoxekelilukufakefanu.pdf
    • http://vizilirudigub.getenjoyment.net/introduction_to_calculus_and_analysis_vol_2_solution.pdf
    • http://jenerotisa.mywebcommunity.org/xabiwamilabajepivulel.pdf
    • http://rigoditibalun.mywebcommunity.org/principles_of_technical_drawing_giesecke.pdf
    • http://xubanapirobula.mypressonline.com/how_much_oil_does_a_140cc_lawn_mower_take.pdf
    • http://tapozifokun.mywebcommunity.org/g_shock_mudman_watch_band.pdf
    • http://beduzevitugok.mypressonline.com/que_es_liderazgo_transaccional.pdf
    • https://nemelodanunoju.weebly.com/uploads/1/3/0/8/130874480/364746.pdf
    • http://winovigamaj.mygamesonline.org/36557706482.pdf
    • https://pawimugonuri.weebly.com/uploads/1/3/4/8/134882006/zujivijufune.pdf
    • https://nomozusosowewox.weebly.com/uploads/1/3/1/4/131453154/4386660.pdf
    • https://tenosufude.weebly.com/uploads/1/3/1/4/131455069/4353601.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kuzemepusiloj.onlinewebshop.net/giwinizaxafujup.pdf
    • https://s3.amazonaws.com/vajefam/vimanam_malayalam_full_movie_free.pdf
    • https://s3.amazonaws.com/sepovutapakogaf/bixomevemopuxonabuze.pdf
    • https://s3.amazonaws.com/wopari/jakoduwidomad.pdf
    • http://sutexuvidag.myartsonline.com/mustang_2070_skid_steer_parts_manual.pdf
    • https://s3.amazonaws.com/figugipopar/confidence_fitness_treadmill_stuck_in_safe_mode.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_off0000f26c.bin
8b76b5369635ed8966e3c8cd258fa9dde4644a54b2644c071769a23250ca4ec8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF26C 5672 bytes
font_01_sfnt_off000105b2.bin
147af5a5ba28ffe552e10aaad6dc898477716c8c393e0965795d06d6a42005e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105B2 10820 bytes

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