Malicious PDF — malware analysis report

Static analysis result for SHA-256 abbbe2e668372d57…

MALICIOUS

PDF

64.1 KB Created: 2021-02-19 12:19:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f9810ac7233c8e33c580e207fa20437b SHA-1: 87db3f6a1a457309ebf739e633da67b607840a10 SHA-256: abbbe2e668372d57efa654af895b24408a507669801c56e54e2facf100b3dc2d
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the presence of embedded URLs and the nature of the link farm suggest a potential for further malicious activity, such as redirecting users to phishing sites or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=how+to+use+a+eaton+fuller+gearbox PDF link annotation
    • https://cdn.sqhk.co/webuzifinuno/1jhbicm/tekadisazugerojegaviti.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419206/normal_6001cc48b17dc.pdfIn PDF document text
    • https://topasotasakaro.weebly.com/uploads/1/3/0/8/130874498/9922657.pdfIn PDF document text
    • https://cdn.sqhk.co/lesepivir/qhfighh/pemowawi.pdfIn PDF document text
    • https://nudilosi.weebly.com/uploads/1/3/4/5/134527742/serufilimim.pdfIn PDF document text
    • https://cdn.sqhk.co/wumigapinido/dYhdRif/sadimudu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450509/normal_602d077bd03b6.pdfIn PDF document text
    • https://cdn.sqhk.co/papebikuwi/gjiihiK/jivubabosofuwudivobopu.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/tzWheb6/download_cool_fonts_for_instagram_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454808/normal_6023847e3243e.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/QgfjbCZ/overland_campaign_battle_apparel.pdfIn PDF document text
    • https://cdn.sqhk.co/reretukida/hjHjeje/most_free_kick_goals_record_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/xewumoxu/hjdhg3m/51341568515.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448341/normal_6020c67f4b98f.pdfIn PDF document text
    • https://cdn.sqhk.co/fidegelotag/cogjkgc/pulsar_125_sales.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rezumasalimod.epizy.com/portacot_fitted_sheet_nz.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_off0000bfd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD8 5196 bytes
SHA-256: d0e9b4b9cc8c11db9b3bcd124ff6e3e614f15d8bc3528090d5981474f82df94f
font_01_sfnt_off0000d1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A6 9952 bytes
SHA-256: 94f00815d9e2af7e28bedba410c09aa37e62142d6db1c71200cacd6ff69a0b54

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