Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f5b338e175f08f…

MALICIOUS

PDF

52.6 KB Created: 2021-09-18 03:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8e404daabf247b6704023983795b7ed7 SHA-1: 12cfd4b11234c4a857427b81be19825a51cceb00 SHA-256: c5f5b338e175f08fbe9f20b812eb3429d4e4f5bf66b88449a448ddf6b7cb4765
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm designed to obscure the final destination. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a technique to distribute links across multiple disposable domains, likely to evade detection and distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8977

Heuristics 4

  • 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
  • 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://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/acd815ac4da39eb464f0f48690596fb5/72914295181.pdf In PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/65727703602.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/mupulepeb.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/67065050248.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/365504_pafopukimid.pdfIn PDF document text
    • http://lagunarent.lt/ckfinder/userfiles/files/muburapox.pdfIn PDF document text
    • https://inks.bg/userfiles/file/61123794294.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/kajexinoj.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/fidiwanoju.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/27055808751.pdfIn PDF document text
    • http://tano-cable.com/d/files/34974902505.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/2758481803.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/161420dbfd558e---73235277926.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/71504864054.pdfIn PDF document text
    • http://kahasat.cz/data/file/46296963114.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/2826815245.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/gololexelufuzu.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/pejife.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/90971208169.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/fimixerowozofodovidup.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/34982884910.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=acceptance+letter+as+a+teacherPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB231 10240 bytes
SHA-256: b2ddc17addf4e72790dc9461fb174fdae47370773574e1e1da2325a921c8a598

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