Malicious PDF — malware analysis report

Static analysis result for SHA-256 83771231595792f6…

MALICIOUS

PDF

81.1 KB Created: 2021-09-11 08:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f944d3320b67be9bef90d3ea617effa1 SHA-1: 2f18da94ed54ef738461780d0b0ccbe599ec0808 SHA-256: 83771231595792f686e15a89edd47e0e39bb65303dd5983276645756d01a4cd9
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm directing to numerous external URLs. The presence of multiple embedded URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to potentially malicious websites, likely for phishing or to download further malware. The ML_NYX_PDF_MALICIOUS score of 0.998346 further reinforces the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://coretry.ru/uplcv?utm_term=mma+stream+site PDF link annotation
    • http://vipforiraq.com/userfiles/files/7809538409.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/xetuvenolimale.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/jimexokuwusen.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/fisolanedilabugexozerudiz.pdfIn PDF document text
    • https://mmtours.si/uploads/vusosavevodotoma.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e8e83688a---70887062136.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/bisujum.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/jakakofowilu.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4bc33b774aae56ca610415b02ec9bc97/69011236044.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210911140310.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/mewupaxabibapevigebejabub.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/59395988323.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/zixivemavuvulivitanetozux.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/76138113682.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/54542064920.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/54508979585.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/bonid.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/72071659762.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/77201418421.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/gefelaxi.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/votamevitupowamus.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_off0000dd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD16 17064 bytes
SHA-256: 75086d7a9e3f1c850c6fb3d4741f1e0f41d35ad8d6479f14aa567ea0d222908d
font_01_sfnt_off00010961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10961 9992 bytes
SHA-256: c1bbe32db98376b1b52df70578222dd36f19db0a7f2a6d146f24804cc491c5be
font_02_sfnt_off00011f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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