Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6c0f71084fa8dcd…

MALICIOUS

PDF

76.4 KB Created: 2021-02-28 16:34:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: b4df6106ea92930094852b51dc78701e SHA-1: f911ef6702658c5b45374e9448a4783b00592705 SHA-256: d6c0f71084fa8dcd157c7b16b3406f6ea1ed00aa649c3eb144703b2772ce0624
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external websites, many of which are hosted on disposable domains or link farms, indicating a probable phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to external URLs, reinforcing the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/award?keyword=should+i+clean+my+outside+ac+unit PDF link annotation
    • https://nafepamozox.weebly.com/uploads/1/3/1/0/131070284/8ff18df6366.pdfIn PDF document text
    • https://vekoduxiboba.weebly.com/uploads/1/3/1/3/131398498/9c909c.pdfIn PDF document text
    • https://lulipexo.weebly.com/uploads/1/3/5/2/135294167/memizoxajufitelatef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365662/normal_5fe4ef27bf223.pdfIn PDF document text
    • https://cdn.sqhk.co/teposodigar/ibHgjhg/muvubobowudo.pdfIn PDF document text
    • https://noperutepa.weebly.com/uploads/1/3/4/7/134721309/7520468.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/how_to_get_bookshelves_fast_in_minecraft.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487665/normal_5fcc5698bb136.pdfIn PDF document text
    • https://cdn.sqhk.co/lajakukilo/ciczVAx/lighthouse_inn_crescent_city_ca_phone_number.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizufofuj/cO0icTg/xonazuwuwozopilif.pdfIn PDF document text
    • https://cdn.sqhk.co/tamoravuwera/dNKoFhh/empire_type_games.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/jPEUbhf/mumeralep.pdfIn PDF document text
    • http://goladelexugezi.sportsontheweb.net/woginitefodotof.pdfIn PDF document text
    • https://cdn.sqhk.co/kidirugolo/hbDxHXq/29957335900.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379046/normal_601fab312ab43.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/amc_8_2020_scores.pdfIn PDF document text
    • http://kopolug.myartsonline.com/law_of_equity_and_trust_notes.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_off0000ef19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF19 5288 bytes
SHA-256: ccd235190e0e2e85e0daab065b5afe6bc68b2ad7938a2acdc8333e4e446eada1
font_01_sfnt_off000100f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F9 10476 bytes
SHA-256: 11a2d901a5e15efe954ab8b5d7c236cceeb65000a267021ffb57518e69c846ee

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