Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b6f146c0922c03f…

MALICIOUS

PDF

79.8 KB Created: 2021-05-20 14:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 344e5a8b45af3cb35c592b5551b7cfa6 SHA-1: 24c51fda3a4e3a90974cef6af2cddc2463b582f1 SHA-256: 9b6f146c0922c03f18fa07a78dc6f22e24f7c71ebe5b794e453b4bd835dafb29
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are disguised as search results or document summaries. The primary URL, 'https://ponafet.ru/strik?utm_term=...', suggests a phishing or malware distribution attempt by masquerading as a search result. ClamAV detection and ML classification further support its malicious nature, indicating it's likely a trojan designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=what+does+the+acronym+abc+stand+for+as+it+pertains+to+identifying+someone+who+is+choking
    • https://cdn-cms.f-static.net/uploads/4502511/normal_6066b15554f46.pdf
    • https://cdn-cms.f-static.net/uploads/4470837/normal_6057ee23b90fc.pdf
    • https://static.s123-cdn-static.com/uploads/4459166/normal_5fcfe79b56e41.pdf
    • https://cdn-cms.f-static.net/uploads/4415081/normal_606e1f24435a3.pdf
    • https://static.s123-cdn-static.com/uploads/4383577/normal_5fcf990fd44fd.pdf
    • https://nevajuto.weebly.com/uploads/1/3/2/6/132695651/50e4ef3f4c9.pdf
    • https://static.s123-cdn-static.com/uploads/4460057/normal_5fde208da8ccb.pdf
    • https://dapevorejux.weebly.com/uploads/1/3/4/6/134695165/4559868.pdf
    • https://gaxopekel.weebly.com/uploads/1/3/0/9/130969853/22c16800.pdf
    • https://fudukonuxevefez.weebly.com/uploads/1/3/4/6/134606022/0c6f8188a9f10.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fedure/leadership_and_the_one_minute_manager_summary.pdf
    • https://s3.amazonaws.com/kesumasaka/9346209429.pdf
    • https://s3.amazonaws.com/zoromexemuzid/botelikaluvumodi.pdf
    • https://s3.amazonaws.com/fejatepudopito/19120239337.pdf
    • https://s3.amazonaws.com/pizivurapab/75962189503.pdf
    • https://s3.amazonaws.com/zerepuzuze/honda_bf_90_user_manual.pdf
    • https://s3.amazonaws.com/wumodukubaru/flyer_vector_design_templates_free.pdf
    • https://s3.amazonaws.com/lanorolowu/buy_acrylic_sheets_canada.pdf
    • https://s3.amazonaws.com/tulosa/answerable_language_definition.pdf
    • https://s3.amazonaws.com/tobito/mamiya_rb67_pro_sd_instructions.pdf
    • https://s3.amazonaws.com/kavalukato/73407451042.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f65c.bin
d750c36041a4a85e36b8e82944cdf8711feb27fa7ccb7a3d38f160f483b2fbde		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF65C 5948 bytes
font_01_sfnt_off00010a95.bin
1f509584771178a618e82f0ade93f407e8e1354aec44c757d0c4be12b7a7a5d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A95 10628 bytes

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