Malicious PDF — malware analysis report

Static analysis result for SHA-256 00adcbff5bbfac7f…

MALICIOUS

PDF

80.3 KB Created: 2021-02-27 13:17:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: f5ce5517c7c5da5aefdbdbd9fb67da0b SHA-1: c0bee186e77b936b72a805c60938fd94bd859dea SHA-256: 00adcbff5bbfac7f3416ad5156d56299c26c3585e212bbc26b0efbd27abd4786
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('lozipotod.ru') and containing a 'chainsaw' keyword, suggesting a lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, further supporting a malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=homelite+240+chainsaw PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4393220/normal_5ff65b87452f6.pdfIn PDF document text
    • https://cdn.sqhk.co/gapalagabig/iWgf5ih/secret_of_mana_walkthrough_nes.pdfIn PDF document text
    • http://saxobupazes.sportsontheweb.net/xekowirakabiboz.pdfIn PDF document text
    • http://zawugudumi.getenjoyment.net/josafugukelirezix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379742/normal_5fe15129e70be.pdfIn PDF document text
    • https://cdn.sqhk.co/wenewojufaj/mhbjpii/52096304855.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426945/normal_602d2acbee137.pdfIn PDF document text
    • https://cdn.sqhk.co/gujawovuk/gdSZito/33812565293.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365660/normal_5fdf19d2c393d.pdfIn PDF document text
    • http://vazawujuzu.sportsontheweb.net/how_much_do_medical_assistants_make_2020.pdfIn PDF document text
    • http://tokexal.medianewsonline.com/12541687195.pdfIn PDF document text
    • http://rejasikega.scienceontheweb.net/34375044426.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
    • https://s3.amazonaws.com/fevobelijogal/54537471276.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/sample_of_lessee_information_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/xawuragevaramexarugevuz.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_off0000ef41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF41 5148 bytes
SHA-256: 9d7c50dc943f63a18d32df3e254c6c1904d9ad3cd7adbe190c5dff1f020b667e
font_01_sfnt_off000100a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A7 11068 bytes
SHA-256: a52bdb66bae1d30dd6d30b0b15d20b2d7ccc85e9683c41dd8afc04fe9c623985
font_02_sfnt_off00012641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12641 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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