Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee9a82c3796a21eb…

MALICIOUS

PDF

85.2 KB Created: 2021-09-19 06:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0ddcd90c4f5ff89cd84bffc8abc83f9 SHA-1: 0b4b1744512b4a9e0226e56aaf5a2d8887cb66c7 SHA-256: ee9a82c3796a21eb0a212ab3b0218493219c28fb87e77b55b5beffad079ccea9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the structure and URL distribution suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://antonellascarpittadesigner.it/userfiles/files/bofaguba.pdf
    • http://ckud.handysociality.com/upload/files/nijokixitonusadet.pdf
    • https://sysyanginguvenlik.com/uploads/files/degefapozebi.pdf
    • http://www.tivafa.hu/upload/file/pujuxiwe.pdf
    • http://www.deep2001.com/images/library/File/89509700820.pdf
    • https://apskarota.org/userfiles/file/wurofuludazokulib.pdf
    • http://keralastatetailorsassociation.com/userfiles/file/dazidagugijazixuxugivage.pdf
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/sasesolopugakalatugepov.pdf
    • http://skrabl.pl/www/rpbd/fck/file/70677372696.pdf
    • http://tuzvedo.hu/elemek/file/wejaxofotasedo.pdf
    • http://ptichile.cl/userfiles/file/suliwi.pdf
    • http://hosungtour.net/FileData/ckfinder/files/20210901_BC91C797BB026DA0.pdf
    • https://lajovisena.com/gallery/file/17962049263.pdf
    • https://oldd.adventurenetbg.com/userfiles/file/fimagokuziduz.pdf
    • http://noithatsah.com/webroot/img/files/piwowivukarumawapalur.pdf
    • http://branonperformance.com/ckfinder/userfiles/files/79144314861.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/aeef741735a57d66b9dc3a50773dd4c8/48741015992.pdf
    • http://vrieshorst.nl/images/uploads/file/56706975835.pdf
    • https://cs-nippon-cp.com/mailmagazine/upload/files/faremijorimuroko.pdf
    • https://mujeresenmovimientoplus.com/userfiles/file/79735418118.pdf
    • http://studiolorenzino.eu/userfiles/files/desagawav.pdf
    • http://orvosvalaszto.hu/uploads/files/vufapexa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=go+fpv+uvc+driver
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4ec.bin
e91f595966dcf3bb2f7e7f41e3fab104e3ed23a6c0ec0b68c699ed220e66be12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EC 10240 bytes
font_01_sfnt_off0000fc03.bin
c9cfb7c1700432f885fd124571d54acba3e3e34529dfc2b85e95adb388a69bff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC03 19556 bytes
font_02_sfnt_off00012fd2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD2 16792 bytes

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