Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2df18da40cb3cff…

MALICIOUS

PDF

73.4 KB Created: 2021-09-10 10:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3ce23576acbf85f4a29d5eabc739d033 SHA-1: e82c986a9f93e0fdb1ebee7c3f0cb6c61ad4a8d8 SHA-256: e2df18da40cb3cff9b022424329485ab634f4ce8f91b85ae14fc7dc414224385
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The presence of numerous unknown URLs suggests an attempt to redirect users to malicious content, likely for phishing or scam purposes. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://cnex.cc/images/blog/file/83613231251.pdf In PDF document text
    • http://recko.ru/ckfinder/userfiles/files/nojobeditunetesoxigu.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/88717187189.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/vefekivaxopulefi.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/basegiga.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/32860294400.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/67493139785.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/26591785619.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa420530e2---53137890736.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/1992480517.pdfIn PDF document text
    • https://advik.net/userfiles/file/xefapuzezu.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/mebofirubisi.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/jazefodazu.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/wefotanilamalametora.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/velesupi.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/joxazulewetazuwoxoreti.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210902_40BA56D14993FC10.pdfIn PDF document text
    • http://www.moyekolodin.com/files/kolukalewegabujemus.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/zaniwefimo.pdfIn PDF document text
    • http://yilip.net/userData/board/file/viraxo.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/gesoven.pdfIn PDF document text
    • http://retailcop.ca/files/woneginewor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=download+mp3+from+starmakerPDF link annotation
    • 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_off0000bd14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD14 16292 bytes
SHA-256: 8d52983f0e5dd3e3c720ef5fe8a2ad12db60a974c5e7d18b376635d5658b391c
font_01_sfnt_off0000e745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE745 10920 bytes
SHA-256: cd137c38dbfb77bdf0340ad552575a29b13fba0c24d8b521f50411cd3d247cd6
font_02_sfnt_off000100a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1