Malicious PDF — malware analysis report

Static analysis result for SHA-256 936319b3acb868db…

MALICIOUS

PDF

79.0 KB Created: 2021-03-22 09:50:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 950b6805ffa0db2f5efd673fc141fb53 SHA-1: 4a3cc38ec08106e051d555d547caf41a814d15bf SHA-256: 936319b3acb868dbd2c116de58d71b336fca1d5fb964fa86da218b371bb079ed
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain designed to appear as a link farm. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', suggesting it might be a generated document. The presence of multiple external URIs and the link farm heuristic strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=dell+t5500+workstation+price PDF link annotation
    • http://pixidilivutep.medianewsonline.com/samsung_bd-p1590_blu-ray_player_remote.pdfIn PDF document text
    • http://maewallace.com/bts_flute_sheet_music_serendipityojzz8.pdfIn PDF document text
    • https://cdn.sqhk.co/sodelaranu/4qjef4q/craftsman_plastic_tool_box_set.pdfIn PDF document text
    • https://cdn.sqhk.co/bubuzibiv/jjckQjb/pakujodofel.pdfIn PDF document text
    • https://cdn.sqhk.co/funixatugesi/Zjigcih/homefront_the_revolution_trophy_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/dgcliiU/durugavitobidake.pdfIn PDF document text
    • http://dofujifeluradep.medianewsonline.com/ayatul_kursi_full_free_download.pdfIn PDF document text
    • http://mitedujonajezed.scienceontheweb.net/boluvatoj.pdfIn PDF document text
    • http://robugipunebib.mygamesonline.org/how_to_list_multiple_possessive_nouns.pdfIn PDF document text
    • https://cdn.sqhk.co/madufuxenuw/jgggdw2/vajetij.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/iihfeje/wasazutilevitoz.pdfIn PDF document text
    • http://rollernefritmassage.xyz/720820978480ceqn.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/dejazuvorira/rapport_de_stage_automatisme_industriel.pdfIn PDF document text
    • http://jasunusemoki.onlinewebshop.net/48404245003.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/online_to_excel_converter_all_pages.pdfIn PDF document text
    • http://muluwokixo.onlinewebshop.net/zaxabeb.pdfIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/1247951328.pdfIn PDF document text
    • http://luvabokinoleg.onlinewebshop.net/22170326574.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_off0000f4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BC 5348 bytes
SHA-256: 6ff581ce3e5e7c1ee31de85b8aa08ac51d8c8783a96677404688b2917bfd37a9
font_01_sfnt_off0001071d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071D 11336 bytes
SHA-256: 6ea944fbc08e8ac5be08bb1e3be089c0381d0a178bbc8ed06f1fa5010bca3790

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