Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b9400631ab60be1…

MALICIOUS

PDF

72.0 KB Created: 2021-05-13 13:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 26338cc2b41cc3fec355011ccea97b09 SHA-1: 971f99b12a7b93f32cce8720639a4950011f5333 SHA-256: 5b9400631ab60be1cfd4d44f983923c14bb813610a79a20ad91e13c0de2b0873
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 a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, indicating it was likely generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://lozipotod.ru/strik?utm_term=how+to+set+interval+timer+on+timex+ironman+watch PDF link annotation
    • http://usesucre.pro/vimixu8fn8l.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://mareson.getenjoyment.net/canon_eos_700d_specifications.pdfIn PDF document text
    • http://fitdieta.com/before_the_flood_worksheetstwq9.pdfIn PDF document text
    • http://anarchymedya.com/233146862568u0x.pdfIn PDF document text
    • http://matemepujibad.scienceontheweb.net/how_to_make_bookmarks_in_adobe.pdfIn PDF document text
    • http://dayzcommunity.info/xumoninamosumis8cur1.pdfIn PDF document text
    • http://ruxenawuxovogu.getenjoyment.net/40278924146.pdfIn PDF document text
    • http://klosheff.xyz/naap_cosmic_distance_ladder_lab_answers6ftlj.pdfIn PDF document text
    • http://centerbluebadge.com/100_common_mistakes_in_english7roas.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://all-system7.club/53536104639mhhiz.pdfIn PDF document text
    • http://fegivate.medianewsonline.com/what_is_the_formula_for_half_life_in_physics.pdfIn PDF document text
    • http://remastacer.com/28349118345zxcof.pdfIn PDF document text
    • http://goods-amzon.com/pegipj5yuw.pdfIn PDF document text
    • http://wownatural.fun/mekarakatetafowzg55.pdfIn PDF document text
    • http://cocobeautybar.ca/xipesowedjxri7.pdfIn PDF document text
    • http://slampochka.ru/dudidogoxarimujuni6rhqq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://dozopedatofol.atwebpages.com/tufux.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/the_carmichael_show_season_1_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/20579688861.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/how_many_calories_in_a_glazed_donut_with_sprinkles.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE26 5008 bytes
SHA-256: a1f6c603c7e19cc077330a10664c1da7294d163d86d7f04bdce9b5fa46c4223c
font_01_sfnt_off0000df05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF05 10816 bytes
SHA-256: 71c496f97b241f310ab8cd2ea4674267bb70948f8703c49f219a30d8b4e06ba5
font_02_sfnt_off00010431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10431 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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