Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8e003c45eb82a8…

MALICIOUS

PDF

86.0 KB Created: 2021-05-12 11:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d9d77744edc68ca94361ad1a02b484e3 SHA-1: 02bedfbdfaf1b825ce8ce75d5c4228c44c821eea SHA-256: bf8e003c45eb82a8c9c746cd6c8d095774debe8a5b72bc53b49992315a3395f5
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs, one of which is flagged as malicious and uses a 'utm_term' parameter suggesting a phishing lure related to appliance repair. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links on disposable hosting, further supporting a malicious intent. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/strik?utm_term=kenmore+electric+range+oven+not+heating+up PDF link annotation
    • http://barbanapoli.moscow/kagidiwtpap.pdfIn PDF document text
    • http://cyberlife.store/tower_of_farming_idle_rpg6s1h9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412778/normal_60121c37746c4.pdfIn PDF document text
    • http://puzigodemabotod.iblogger.org/9444772626.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492555/normal_5fe42e51f2355.pdfIn PDF document text
    • http://goxopisejeza.22web.org/yoga_position_book.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462093/normal_5ff6c918aea4d.pdfIn PDF document text
    • http://kukushka.space/how_long_is_a_dyson_warranty0gm8s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484359/normal_606621fdd94f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468253/normal_5fe12d4ef2ff6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475734/normal_6051f0dfaf50d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380525/normal_6051ac51c38ea.pdfIn PDF document text
    • http://fredo.bike/ssc_cgl_chemistry_questionsvwlvu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420454/normal_6048574f2f8a9.pdfIn PDF document text
    • http://usacreditcheck.info/howard_leight_impact_sport_black_bolt_earmuffs_australiatvce3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://robajev.rf.gd/to_kill_a_mockingbird_by_harper_lee_characters.pdfIn PDF document text
    • http://kowopiri.rf.gd/sogolofodaxufimet.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/safety_measures_in_construction_site.pdfIn PDF document text
    • http://jibukut.epizy.com/kda_akali_wallpaper_hd_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/fewokoxaxukonogomi.pdfIn PDF document text
    • http://wixudilasajigil.rf.gd/43795898093.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_off000113d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D2 5196 bytes
SHA-256: 31e852be0eb0cc5901a6557b0253e52fed9f195ffe9f6484ac7e278c4c286a8c
font_01_sfnt_off00012566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12566 10888 bytes
SHA-256: 4dee901a979877a8d606b0fdb34fd2d45830e46f6c956ce4117a9db5f8ce198a

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