Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2381142df4ee055…

MALICIOUS

PDF

71.6 KB Created: 2021-02-16 20:48:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 816c3ca059f1bc55e3bef4f07a6c92ea SHA-1: f509d60916ba7e077a9001dd7bedcecb8c1d39ca SHA-256: c2381142df4ee055620882e6d8d7fb4fba0d4f8268350494a30bc5391c032ca6
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to 'jacksth.ru/strik' and another to a link farm on 'epizy.com'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document body, though heavily obfuscated, contains references to 'Casio g'zone boulder verizon' and 'wkhtmltopdf', suggesting a lure related to product information.

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://jacksth.ru/strik?utm_term=casio+g%2527zone+boulder+verizon PDF link annotation
    • http://circulshtangcalip.website/leadership_competency_example_answers_civil_servicem291b.pdfIn PDF document text
    • http://mabay.fun/gevugozitiga0r41z.pdfIn PDF document text
    • https://cdn.sqhk.co/wanolugago/gQJiehg/46933137922.pdfIn PDF document text
    • http://compte-cmbretagne.best/pregao_expositiva_livro_saraivag4dhp.pdfIn PDF document text
    • http://abistrans.ru/ageing_app_androidzalon.pdfIn PDF document text
    • https://cdn.sqhk.co/vivakawibaki/hghf2rS/college_world_series_baseball_2017.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gikisomu.epizy.com/dematexegotalupun.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/33450954094.pdfIn PDF document text
    • http://nejowubixulifud.rf.gd/idle_empires_guide.pdfIn PDF document text
    • http://leporib.epizy.com/gangtok_tour_guide_from_kolkata.pdfIn PDF document text
    • http://bibekuxamawijoz.epizy.com/13422519222.pdfIn PDF document text
    • http://xumusemowujev.epizy.com/zulawumariva.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/86638330013.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_off0000dc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC10 5180 bytes
SHA-256: 05dc25142ed36858831f9836c653cb370769926d2f062090377b87b02797e103
font_01_sfnt_off0000edc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC9 10624 bytes
SHA-256: e5da7d8a6474fd662e8fecd0b96c4bbca5e307be30dd3d491adccf8d3d432f64

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