Malicious PDF — malware analysis report

Static analysis result for SHA-256 f57a33cc7dce6115…

MALICIOUS

PDF

83.7 KB Created: 2021-09-23 03:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c5158d09254586d7ed03e9ed8cce2118 SHA-1: 0309cd63238cf50f0e762d85176e57403482a9f9 SHA-256: f57a33cc7dce61159153294b0078d8105d0eccbc3e6c927150431edab196be96
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to suspicious domains, many of which are associated with link farms and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true destination by using many low-reputation links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://oniceh.ru/uplcv?utm_term=deadpool+1+online PDF link annotation
    • https://slavyansk.biz/userfiles/file/zixexuwa.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/62324761836.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/nakuxi.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/tuvamurudimebuvapefesux.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bfbc2d124---nolife.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/9o2albca6jl4q7143inb87gj0g/losafakuxag.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/50945304676.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/99184866319.pdfIn PDF document text
    • http://runhouchem.com/upload/files/93488177328.pdfIn PDF document text
    • https://upaspor.com/resimler/files/47090112638.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/36098195871.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/49981672484.pdfIn PDF document text
    • https://greenways.at/userfiles/file/farililu.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/21704222848.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/sinesotida.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/22770376616.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/majajolegobajit.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/14235178659.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/godiraneditewixubokusoru.pdfIn PDF document text
    • http://columb-sklep.pl/userfiles/file/redutavifa.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/77013348134.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/53107014798.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/49385143596.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCA 10072 bytes
SHA-256: a6c53f2395b2bc6ddf0bdf984b948527a46ae8285da0be3e34a2d2ae9c33ccaf
font_02_sfnt_off00011239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11239 18348 bytes
SHA-256: a5f41c057683489be8cd9c00ebd365860abbc3738119078478f1eb97c6e2bf10

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