Malicious PDF — malware analysis report

Static analysis result for SHA-256 9456f1cea77244f5…

MALICIOUS

PDF

73.6 KB Created: 2021-02-25 14:56:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: e83e49793b4b5a1e4a7e60ec7648526d SHA-1: ecdcea6f80d2153bead87dcdda6834461f4966f8 SHA-256: 9456f1cea77244f5ae48d8f50861d6eaea8083f01e1e56300ac96a37be93b398
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a notable heuristic indicating it's a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to 'oss training video' and the authoring application, likely serving as a lure.

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://bologen.ru/123?utm_term=oss+training+video PDF link annotation
    • http://pazadixokumox.sportsontheweb.net/what_is_the_theme_of_the_story_glass_menagerie.pdfIn PDF document text
    • http://usesalon.xyz/pride_and_prejudice_2005_full_movie_dailymotion7q92u.pdfIn PDF document text
    • https://cdn.sqhk.co/rizitewav/gfhajh3/oxygen_atomic_structure.pdfIn PDF document text
    • http://nopotaz.medianewsonline.com/xalitotexifimerotumini.pdfIn PDF document text
    • http://lamakexo.scienceontheweb.net/epson_wf-2530_printer_wont_print.pdfIn PDF document text
    • http://a1metromovers.com/15893765213d7y3m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/juvovidu.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/meme_alto_sax_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/batch_convert_html_to_linux.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/bike_race_3d_game_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/writing_a_resignation_letter_uk_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/2016_chevrolet_colorado_user_manual.pdfIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/roduxovalezek.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_off0000e4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E1 5048 bytes
SHA-256: 288f284d82e5516f39fffbd1ad491436e37b691f2206e51151902e13cb26f9d3
font_01_sfnt_off0000f622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF622 10480 bytes
SHA-256: 1ea60f9cdb187b1c46d7f08487dea3e1099176944d83ed8d35cb2e6370c08545

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