Malicious PDF — malware analysis report

Static analysis result for SHA-256 02af720227bc40f3…

MALICIOUS

PDF

74.9 KB Created: 2021-03-21 03:23:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f4baedb9a5344f06163b00afff0183f SHA-1: 36d664a710a4716e90326f06e0f16db9700e7d8a SHA-256: 02af720227bc40f3c0e84d4e7f8c8d654fbd8f654fb5bd03242540dcbce7ba4e
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/award?keyword=phonetic+chart+english+pdf
    • https://letotanuvimipe.weebly.com/uploads/1/3/4/5/134598603/9384094.pdf
    • https://cdn.sqhk.co/xaloridinef/phihcEm/simple_background_changer_pro_apk.pdf
    • http://hightrade.club/93276634448shraw.pdf
    • http://medolufinumul.sportsontheweb.net/pdf_burdah_imam_busyiri.pdf
    • http://creditactive.info/nejezofudezawxizpn.pdf
    • http://watogoda.mypressonline.com/8603815284.pdf
    • https://bavipemafenun.weebly.com/uploads/1/3/1/3/131398101/xoligefemugokix.pdf
    • http://insta-sale.site/html_and_css_tutorials_for_beginnersbx9kd.pdf
    • http://cenderaoriginator.com/marksheet_formatcs87h.pdf
    • https://cdn.sqhk.co/dogilijesiwu/hg9hj8C/zimenimapowusimomexuvu.pdf
    • https://cdn.sqhk.co/fujonexa/3TI89hh/lebaz.pdf
    • http://feyakast.online/orbit_water_timer_repair76p1j.pdf
    • http://tavegumata.sportsontheweb.net/4582708969.pdf
    • http://gigezojiradof.scienceontheweb.net/95072517894.pdf
    • http://sinomefonok.mywebcommunity.org/sovuvaradoz.pdf
    • http://fonudesuwobulud.mygamesonline.org/hunger_games_novel_free_download.pdf
    • http://fixmarker.fun/what_is_an_unconscionable_contractg41pj.pdf
    • https://cdn.sqhk.co/bosavoked/hchcjhg/best_buy_2020_super_bowl_tv_deals.pdf
    • https://cdn.sqhk.co/kixowijeka/VmigSxH/aashiqui_2_songs_list_audio.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dubanexotokegel.myartsonline.com/97614559426.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
stream_003_off0000f1c5.bin
7823f44533844d0e0e7934aaea21f8517de528972d9fad9c329e4ec6a02d4230		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF1C5 12916 bytes
font_00_sfnt_off0000df59.bin
b9ab994709a9d5a24b4f99e78b75fc55656969bf61de49010637a828906295ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF59 5420 bytes

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