Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5589dbbd23ebe7f…

MALICIOUS

PDF

71.6 KB Created: 2021-06-07 08:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 187ef8436c5b8978893897e54c1aa7c5 SHA-1: 5e23a1d90045c4c5be2e9a5b6922a09d94d02df9 SHA-256: b5589dbbd23ebe7f3ab304525565193f71c3496ab8b0ac2ec27921ddff353735
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a likely phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

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://queure.ru/pbw?utm_term=pokemon+emerald+rom+v+1.0+usa PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4420438/normal_6000537e44b07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_5fea1c93ef13d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416787/normal_5fe7a8cf11ffa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447631/normal_60218b11282de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417207/normal_5fee37c7d271b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415051/normal_5ff7e2a51f583.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418184/normal_60004c3d1a619.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383137/normal_602155d2404db.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4477863/normal_60b3d116115ba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nilanom.pbworks.com/f/62152078654.pdfIn PDF document text
    • http://numefen.pbworks.com/w/file/fetch/144633672/australian_visa_application_form_956.pdfIn PDF document text
    • http://tefimemovem.pbworks.com/w/file/fetch/144760713/99092756319.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/963cffff-f03f-4077-aedf-1123e59294ac/98962062342.pdfIn PDF document text
    • http://pafunanukexe.pbworks.com/w/file/fetch/144522957/lixebutigafor.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/f/5942055893.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c05715f8-1647-4500-a928-504d9adc7494/when_you_have_time_to_think_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88cc259b-16f1-4e27-b4a3-a5f9c5d31ba1/92885069700.pdfIn PDF document text
    • http://rerikisozid.pbworks.com/w/file/fetch/144639633/169542893.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6cd672d-283d-4e14-ab46-349009952ce3/99632789258.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d77d28d6-e2fc-4643-b603-79612fbcc4ef/lulixulokifumetudatote.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_off0000d718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD718 5320 bytes
SHA-256: 63cc9b5180c8a709dae8f9a6a4a7d1f40b09e11c3e68581152f8659d42dacee8
font_01_sfnt_off0000e926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE926 11720 bytes
SHA-256: 6891e9c1229c41883c0eaa4cb0293893b01308bcf5ae0585a6c6b66432ab300a

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