Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b51cb60c93f7991…

MALICIOUS

PDF

99.5 KB Created: 2021-04-02 18:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1e87086618c86e6d6af640eb6d813228 SHA-1: 255bafe4a873825fed2723be81d170edf4146f16 SHA-256: 3b51cb60c93f79912f48037bf74250838ec3a90d20f5c9f97ddcf77fc7d3b91a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are obfuscated or lead to benign content, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The primary malicious URL identified is https://nipisod.ru/strik?utm_term=la+luz+del+mundo+hoy.

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 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://nipisod.ru/strik?utm_term=la+luz+del+mundo+hoy PDF link annotation
    • https://cdn.sqhk.co/josedinis/fjhzajh/printable_christmas_bingo_cards_with_numbers.pdfIn PDF document text
    • https://cdn.sqhk.co/lirerafi/hgjdgco/70450438451.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421776/normal_6000c9bb2f897.pdfIn PDF document text
    • https://cdn.sqhk.co/geruxibab/k8PgGud/70076463981.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373985/normal_5feb97ee14de4.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/cannery_row_chapter_1.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://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_3893216ff9524aee9a9bacc3f27dd97a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/jezepevadutogemov.pdfIn PDF document text
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_7d6f18f7ef124ff68292d729fe57dd9e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zikeko/libro_proceso_de_la_investigacion_cualitativa_nelly_patricia_bautista.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/9648808425.pdfIn PDF document text
    • https://8ed6bd9f-de2b-4923-b7df-82f95eb18a03.filesusr.com/ugd/7fa32f_268dc0ddff544c3b84a918dd6398bc3e.pdf?index=trueIn PDF document text
    • http://tujupifirafadus.myartsonline.com/38214475962.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/dobodini.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/907763960.pdfIn PDF document text
    • http://madigekole.onlinewebshop.net/catcher_in_the_rye_chapter_summary_13.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_off0001381a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1381A 4640 bytes
SHA-256: a1ea43313de985bb3baf60c504a5a50a412090e26d97050c3f998b23b60f82ec
font_01_sfnt_off000147b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147B3 12908 bytes
SHA-256: 877aee75630e58de8ce7570adfeca0d6441de001f112e7b4d82e38f5bf8951ce
font_02_sfnt_off00017182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17182 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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