Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb9d6df7c87f99a…

MALICIOUS

PDF

71.3 KB Created: 2020-12-22 12:24:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: eddf119010dddefd6cb65795e936a126 SHA-1: 39b3ea7304de281a025fd8d8bd6b8746f26745a2 SHA-256: ffb9d6df7c87f99a4424c6381ffcaf3370944a32e2c467b99840ea8e02d4de22
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/strik?utm_term=mystic+messenger+zen+route+day+11 In PDF document text
    • https://zelogevoge.weebly.com/uploads/1/3/1/4/131483318/momagukasova-tuviwojunupezir-mogefud-takamilu.pdfIn PDF document text
    • https://pebekokinusixi.weebly.com/uploads/1/3/4/5/134506994/0cfcb6.pdfIn PDF document text
    • https://zavisedifigi.weebly.com/uploads/1/3/4/3/134316550/5862243.pdfIn PDF document text
    • https://tovozilulu.weebly.com/uploads/1/3/0/8/130873983/7cc40ece72.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/werowibovezoje/39537020442.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/best_smoothie_recipe_book_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0512000-faf9-4325-a823-7422df48d179/detonodawebo.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/adaptive_control_tutorial_petros_ioannou.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7763f96-b523-4c5f-82d2-be124a57e6fb/87021001316.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8dba98e-cb96-4d39-a985-a2609dd23e18/58991687793.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/absolute_value_equations_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/hacks_for_minecraft_windows_10_1.16.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/097f9477-5841-4c3d-9f82-69b0f614570f/total_war_warhammer_2_sword_of_khaine_how_to_get.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_off0000cf29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF29 5436 bytes
SHA-256: 2a508524f0eeeac9d6c1ff442e596fd32ffba8d9a12f67f81379178148b5ad99
font_01_sfnt_off0000e1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A7 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off0000ea35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA35 10988 bytes
SHA-256: 91f3d006d2864f1186ee3316fd58af9fc774bd930e136f40f576eba3a356f37a

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