Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b6c8dc97c553b27…

MALICIOUS

PDF

78.0 KB Created: 2021-04-09 19:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 41ea9a89bbcdb492fb31535a2c172274 SHA-1: 69e93ad20ce9824e8549c6bc0731e21d637a9738 SHA-256: 3b6c8dc97c553b27bab9d85fcd53e0b18bf9b617d074f85ee78ba17258e649cc
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to a site associated with a link farm and potentially malicious content. The document body, though partially corrupted, suggests a lure related to educational requirements, directing users to external resources.

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://zajinet.ru/strik?utm_term=k+state+general+education+requirements PDF link annotation
    • http://bexixibeguben.sportsontheweb.net/fepepuvo.pdfIn PDF document text
    • https://cdn.sqhk.co/zinumazak/l6FDgjb/vuvexanizosizomigaf.pdfIn PDF document text
    • https://cdn.sqhk.co/jovojatubo/dhaehbt/premier_league_fantasy_gameweek_28.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/jfKpRhj/cosmopolitan_las_vegas_hotel_deals.pdfIn PDF document text
    • http://pifumufupes.iblogger.org/intracranial_pressure_pulse_waveform.pdfIn PDF document text
    • https://cdn.sqhk.co/zuzipogowita/VQifhgv/download_video_from_instagram_app.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/around_the_world_in_80_days_full_movie_in_hindi_filmyzilla.pdfIn PDF document text
    • http://vetovikaxu.mypressonline.com/airline_ratings_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolefowi/f4jigfK/red_bull_space_jump_balloon.pdfIn PDF document text
    • http://kigaruzolalo.mypressonline.com/computer_science_question_and_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/aY0YAhd/patosevemavowepadi.pdfIn PDF document text
    • https://cdn.sqhk.co/wugotiparo/gh2hc5F/does_paris_texas_have_an_eiffel_tower.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9ade9a4-02c2-415f-96f5-1d55a15a918f/70386315996.pdfIn PDF document text
    • http://pujumek.myartsonline.com/recent_advances_in_plant_biotechnology_and_its_applications.pdfIn PDF document text
    • http://tepominofujemo.atwebpages.com/27238030351.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8ce8f9d-dbbf-4729-92f0-e7620e2fee86/how_many_books_are_in_the_maze_runner_series_in_order.pdfIn PDF document text
    • http://mufizepumu.rf.gd/someone_anyone_something_anything_somewhere_anywhere.pdfIn PDF document text
    • http://niselasot.atwebpages.com/84078620194.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c9ff709-8647-40c2-90f0-d0ccc06999cd/how_to_read_tom_sawyer.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_off0000f539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF539 5352 bytes
SHA-256: 3fc265e535bb9aedeb3e57a04e4eafb72328c9635836422bbe201c09cb1ea6a7
font_01_sfnt_off00010755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10755 10456 bytes
SHA-256: 82322352b00e7d22db0b904b2c8bc7a16f1aa565b89d3f8417869c598fd67dd7

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