Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b4a3661ff9943d…

MALICIOUS

PDF

85.3 KB Created: 2021-09-20 19:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5e79e056c40f50734190b01dbd79cd53 SHA-1: c54d578a8e6d7c02077fccf984b4c29a4613de05 SHA-256: c3b4a3661ff9943d4a5b95ec1c28a9c99c665408f8b8047c02a6e1cfcc1524d9
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable or unknown domains. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://partetesal.ir/data/file/29803744723.pdf In PDF document text
    • http://devison-matras.ru/upload/file/xizaxifobisivuli.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/14484220536.pdfIn PDF document text
    • http://didula.com/img/file/8884657305.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efcc0125bd---15376238471.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/21755013168.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/gafigesilarikite.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/tijinowogono.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/27503446737.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/xexipavoripoxelunasixuwas.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/52979563564.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/85324744031.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/varekojaliwumekifoz.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/87473538444.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/54871386648.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/gupufixodapudoxoboguz.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/34374712061.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/95d86688829ff41d712efa37da1d577d/zefotofabafurakudijub.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/66077214435.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/dezajopebirajid.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/nugilenonusizobolura.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/10196445839.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=sauvegarder+les+sms+android+sur+pcPDF 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_off0000e613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE613 18920 bytes
SHA-256: 237de32cdfa2bcd19f4c7ad602fe75dd7acd8a9845aa5e2ad6bd4f1cf4db8968
font_01_sfnt_off000115d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DED 11000 bytes
SHA-256: aa1ebcb9e2d25008edd02b5a35b46782772f7e4c029cdb64159cef18958777ac

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