Malicious PDF — malware analysis report

Static analysis result for SHA-256 232783fbd53ac9dc…

MALICIOUS

PDF

76.0 KB Created: 2021-03-10 03:07:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 7ea5d94f8b329d614f5267d4710c9914 SHA-1: 2b82e7c6d6b508d050183ef03c5968d1698806ad SHA-256: 232783fbd53ac9dc440860f38f33684d57b8a389e8d4583887feb00fdd195f65
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs points towards an attempt to redirect the user to malicious content.

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://mezovuduw.ru/strik?utm_term=beretta+m9+22lr+holster PDF link annotation
    • http://cetop.xyz/potalinokeriwuzia1d.pdfIn PDF document text
    • https://cdn.sqhk.co/fiduzosi/6icgg2f/cash_app_customer_service_reviews.pdfIn PDF document text
    • http://frukt.space/jewobigobevipanomunumiqqr9.pdfIn PDF document text
    • http://haustova.com/icse_9th_class_maths_book_free_downl1jsc3.pdfIn PDF document text
    • http://f1l3download.site/how_to_connect_plantronics_headphones_to_cisco_phonedg7bh.pdfIn PDF document text
    • https://cdn.sqhk.co/jibenapola/hbgjGiT/flying_car_robot_3d_game.pdfIn PDF document text
    • http://4bochki.ru/free_esl_phonics_worksheetsrjg9r.pdfIn PDF document text
    • https://cdn.sqhk.co/govazofaj/MEhiQiG/51977284301.pdfIn PDF document text
    • https://cdn.sqhk.co/vameduvide/biegghf/direct_and_indirect_speech_exercises_with_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_5c207e2c397d45ff8c965075d92a6ac9.pdf?index=trueIn PDF document text
    • http://nedupidanasadef.rf.gd/kexakokesikafewalemopeta.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/20583540093.pdfIn PDF document text
    • http://negifunowulag.rf.gd/leeds_building_control_application_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/3796732473.pdfIn PDF document text
    • https://efa91360-7c21-416c-9d60-3189e0beb381.filesusr.com/ugd/42ffc7_210d9f09903145bcb1d76b9e460aea11.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/rojowuwukef.pdfIn PDF document text
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_48f11c64560f4616b3eba6ad6a8b81ac.pdf?index=trueIn PDF document text
    • http://bugexiwur.epizy.com/demojomifugegigitog.pdfIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_140a4ca5a88c4b9da646288bc2d1e3da.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/how_hard_is_the_nclex_pn_2020.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_off0000ed19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED19 5264 bytes
SHA-256: 1f1e76c89b4ee13b33c3f439ae19e232d223027658fd6827239f2c2a635cc4df
font_01_sfnt_off0000fec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC8 10632 bytes
SHA-256: 9c0dcc8764ff1be3a6422e5deccd2d6f8395d1ed549ba875634a829822e7a829

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