Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6440a41e6e26553…

MALICIOUS

PDF

78.5 KB Created: 2021-03-10 04:50:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4195e3cdf248bc8e611ffed47fba4759 SHA-1: b10616d7689bc117f8bc748f9824385d99e47b78 SHA-256: c6440a41e6e26553cbe8f302097f9150be05654d217520ca936bb4de4ea86923
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains a large number of external links, many of which are likely part of a link farm designed to improve SEO for malicious sites. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document attempts to trick the user into installing a browser extension or update. While no scripts were explicitly extracted, the presence of external links and the lure suggest a phishing or malware distribution attempt, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://xezojetit.ru/strik?utm_term=rca+atlas+10+pro+tablet+with+detachable+keyboard PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450889/normal_6032481472949.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457862/normal_5fe2fd25c1485.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/x9iagcN/slot_machines_for_sale_ohio.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381085/normal_5fe49c76b93ab.pdfIn PDF document text
    • https://cdn.sqhk.co/mibemofega/Ujgichd/8441152199.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471253/normal_6007a1e218c79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494648/normal_5fe83b289f497.pdfIn PDF document text
    • https://cdn.sqhk.co/xenojepezere/geDwhjx/dark_side_alan_walker_lyrics_karaoke.pdfIn PDF document text
    • https://cdn.sqhk.co/xolanikipiz/hdNTEUq/star_wars_bacta_tank_toy.pdfIn PDF document text
    • https://cdn.sqhk.co/jutigurotow/fIhezjg/weken.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/cooling_tower_calculator_free.pdfIn PDF document text
    • https://a9f3490c-def6-45ea-9957-aefa341d54bd.filesusr.com/ugd/84b587_b7d93e869f004bc291496c35fb0509c1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/type_2_diabetes_eating_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/58187518255.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/heart_disease_ppt_template.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/96926608377.pdfIn PDF document text
    • https://d89d6b52-6e76-4e18-bccb-bd7428cfddad.filesusr.com/ugd/02beb7_c6e5b991c51d4cd39c065776f2ab001d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/17856992167.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/el_arte_de_la_guerra_sun_tzu_pelicula_completa.pdfIn PDF document text
    • https://f77c8dad-41d7-4a8f-8d8d-c05149a3a236.filesusr.com/ugd/36d413_2f70279d4cac4ca4912e4a4ca9a6f72d.pdf?index=trueIn 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_off0000f376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF376 5760 bytes
SHA-256: 72214238f6a30fbb60b5d874d193bb4cf5ff57914afbb4d47c72fb96b20ec30d
font_01_sfnt_off0001071e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071E 10740 bytes
SHA-256: 05d1771297302eb02be113028b16ff45e476ab75fda9ea4bec6f96799150c597

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