Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f58cc7405db0f38…

MALICIOUS

PDF

77.0 KB Created: 2021-03-01 09:06:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d8e0ccae9fafca938041a175ec39237 SHA-1: 728aad5ed0c8d49e3ba1b7a0ae5459e4b2adfeb1 SHA-256: 2f58cc7405db0f389f2d1701246ee81942fac27770928d5f37929f4329a93ac0
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, many of which point to disposable domains and are likely used to redirect users to malicious sites or phishing pages. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a link farm designed for SEO manipulation or to host malicious content.

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=batman+new+52+goodreads
    • http://julivojurukumu.sportsontheweb.net/the_most_effective_whitening_cream_in_nigeria.pdf
    • http://wisecredit.info/746610761064pou4.pdf
    • http://lewijufe.sportsontheweb.net/pen_is_mightier_than_the_sword_phrase_meaning.pdf
    • http://ital-girl.space/adding_integers_notes3zhv9.pdf
    • http://geparup.scienceontheweb.net/friday_night_lights_book_sparknotes.pdf
    • http://adminhalil.com/78254337901fa0ob.pdf
    • https://cdn.sqhk.co/vumusokutil/Ghdjj40/don_t_become_a_game_developer.pdf
    • http://tanemazijafawin.medianewsonline.com/how_do_i_change_the_audio_output_on_my_samsung_tablet.pdf
    • http://roxelejabojafe.scienceontheweb.net/marvel_schebler_carburetor_tsx_34.pdf
    • http://kusulapezep.iblogger.org/69073102254.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zopefaku.rf.gd/conventions_of_drama_in_literature.pdf
    • http://zobovobewuw.epizy.com/hey_movie_soundtrack_by_bukunmi_oluwashina.pdf
    • http://bavosezema.epizy.com/outlook_2016_all_emails_from_server.pdf
    • http://kopolug.myartsonline.com/bafezujofupopexazaf.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_off0000f041.bin
6a3c894cd03943e430a2533599ac18dd654ee33606808c694e6270980f0aa1e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF041 5508 bytes
font_01_sfnt_off000102ff.bin
d38900daaa01e769eb37bf7c3e993877f1b132a8fc3b7dfa316576cf839844c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102FF 10532 bytes

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