Malicious PDF — malware analysis report

Static analysis result for SHA-256 53bc70c43cf2ece9…

MALICIOUS

PDF

74.5 KB Created: 2021-03-15 19:58:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: dac58a7420e800a54d0cf63ef111a023 SHA-1: b18a35792670357317e3a84af06fda491e50e1fb SHA-256: 53bc70c43cf2ece93b9c4b0452536b741ea763510b5acfd57076897d461d24ca
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. The document contains numerous embedded URLs, with one specifically pointing to 'vilenefex.ru', suggesting it's designed to redirect users to a potentially malicious site. The presence of a link farm heuristic further supports the idea that this PDF is part of a larger scheme to drive traffic to various domains.

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://vilenefex.ru/123?utm_term=genetics+punnett+square+worksheet PDF link annotation
    • http://umdtheatre.ru/18425128629ht914.pdfIn PDF document text
    • http://cocobeautybar.ca/funny_pictures_gif_animation150o3.pdfIn PDF document text
    • http://outputqwvk.space/pekedobafubelabazaxilegodaljyj.pdfIn PDF document text
    • http://bijeruma.iblogger.org/architecture_books_download.pdfIn PDF document text
    • http://tewatag.medianewsonline.com/kindle_paperwhite_4_2018_manual.pdfIn PDF document text
    • http://vukesis.iblogger.org/dreamweaver_8_free_for_windows_xp.pdfIn PDF document text
    • http://tublitalia.fun/kegafesuvivu0829.pdfIn PDF document text
    • http://vir-tus.com/fruits_mania_fairy_rescue14o89.pdfIn PDF document text
    • http://jojidasusesot.sportsontheweb.net/aditya_hrudayam_lyrics_in_kannada.pdfIn PDF document text
    • http://rowowevu.mypressonline.com/mystery_brain_teaser_puzzles_nz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tifavamifikas.myartsonline.com/69022829849.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/calciform_d3.pdfIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/taxenigekixozukin.pdfIn PDF document text
    • http://kepinud.rf.gd/medetefola.pdfIn PDF document text
    • http://xovolefewawex.atwebpages.com/87688035863.pdfIn PDF document text
    • https://s3.amazonaws.com/mevuzokekenojab/81855608544.pdfIn PDF document text
    • http://baletax.onlinewebshop.net/le_tissu_cartilagineux.pdfIn PDF document text
    • http://mubinubamep.rf.gd/43067745491.pdfIn PDF document text
    • http://tujefozumuresul.epizy.com/software_delivery_note_template.pdfIn PDF document text
    • http://poniweja.rf.gd/how_to_charge_jbl_clip_2.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_off0000e488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE488 5300 bytes
SHA-256: 6bac10681ef95426e96e23838b257af2229dd9bddf5208b63542dab44d4e5a1c
font_01_sfnt_off0000f6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A8 11328 bytes
SHA-256: 73f6dcc645d7eec7c4a726a14d2463f322c720900c1c22935a6901dc09a1150a

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