Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f605a763be07c14…

MALICIOUS

PDF

66.3 KB Created: 2021-03-29 09:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9930555925dcf961a56a91e8812ff6aa SHA-1: b9ac85bee484aba970aa50cb90721fa61eaf52b3 SHA-256: 7f605a763be07c145eb957a1da199a9bc1b94a26f07494b465ab70f7f00fb3d5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/strik?utm_term=brandsmart+sony+tv+sale
    • http://rolivazugatar.scienceontheweb.net/when_should_i_apply_for_excelsior_scholarship_for_fall_2020.pdf
    • http://najisemure.medianewsonline.com/72943545860.pdf
    • http://gewututikame.getenjoyment.net/carbonate_reservoir_characterization_jerry_lucia.pdf
    • https://telisawe.weebly.com/uploads/1/3/4/4/134466193/7165646.pdf
    • https://werotibumef.weebly.com/uploads/1/3/4/9/134900185/vezajoxomil.pdf
    • http://sdorovie-sustavi.xyz/third_grade_learning_games_apk7j62u.pdf
    • http://lenugaguv.medianewsonline.com/malenigaketexa.pdf
    • https://watogovujun.weebly.com/uploads/1/3/4/6/134626060/nenivululabix-zesaw.pdf
    • http://iuts.space/xipegadezegardn8z.pdf
    • http://gosepakaf.getenjoyment.net/xabunek.pdf
    • https://dewubixire.weebly.com/uploads/1/3/1/3/131398231/kawewalitizugosuturo.pdf
    • http://wamipivifubape.sportsontheweb.net/dexipafizekekepet.pdf
    • https://garowowo.weebly.com/uploads/1/3/6/0/136033653/0ba48.pdf
    • http://musomojil.mywebcommunity.org/buxerazegiberofawowazur.pdf
    • http://petrol-v-pol-price.site/what_type_of_engine_is_in_a_generac_generatorwcw7d.pdf
    • http://xazupadapafow.mypressonline.com/binary_options_trading_basics.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://widusop.atwebpages.com/30271983353.pdf
    • http://suzifoki.myartsonline.com/does_pack_n_play_need_a_mattress.pdf
    • https://s3.amazonaws.com/rewepalazamiso/empires_and_puzzles_guide_2019.pdf
    • https://s3.amazonaws.com/lekelepowo/cuales_son_los_organos_diana_del_sistema_endocrino.pdf
    • https://s3.amazonaws.com/vikukinumet/kevezetunuk.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_off0000c6f3.bin
939ff3bd8984a2263e5657ac794b01008fff79c4d13bfb889fcd2047a37687b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F3 5184 bytes
font_01_sfnt_off0000d888.bin
48e7dba92d5d840b7661d4286d1f441e38bf2cc67863847d4d9b6d6fd885c471		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD888 10496 bytes

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