Malicious PDF — malware analysis report

Static analysis result for SHA-256 b225a516ce28897e…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 11:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ea0f3f849b11a3313acd9899688a1aa SHA-1: 8336bc78c1a693c475758dc33333722e34494322 SHA-256: b225a516ce28897ee29547171b5c0148fb0042e6d1a293721e9151964d4ca61f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate the PDF is a link farm on disposable hosting, with numerous embedded URLs pointing to PDF files. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://okvin.org/userfiles/file/46608824138.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/8b76541ea9de019466eccfd31755f616/93053915940.pdf
    • http://gysanya.com/upload/file/210920001622014347o8avsd3u40oa.pdf
    • http://guojingmall.com/userfiles/file///20701702087.pdf
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/vixinugebemovudar.pdf
    • http://thai-apsproducts.com/file_media/file_image/file/zowuvemuzeronamanavod.pdf
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/39631369578.pdf
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/49652234995.pdf
    • http://phongkhamthienhoa.org/images/files/bitidatuboxesupe.pdf
    • https://absoluteanytime.com/media_file/files/files/94678175517.pdf
    • https://preprodpcb.com/userfiles/files/71285913647.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/a59d94c7d27bab042fa72b6888e98a5a/zewuxupifimisat.pdf
    • http://gruppocinofilomarsalese.com/userfiles/files/8566739403.pdf
    • http://tdbakademi.org/userfiles/files/lewibifewar.pdf
    • http://feriaalainversa.com/uploaded/files/jokifegosomi.pdf
    • https://hotel-la-licorne.fr/userfiles/file/14060628344.pdf
    • https://cornerstonelaw.eu/userfiles/file/56225682188.pdf
    • https://www.rapn.ru/ckfinder/userfiles/files/33986628250.pdf
    • http://studiopedrazzini.eu/userfiles/files/10579236247.pdf
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/wekexisol.pdf
    • http://f-okinawa.com/img/tmp/files/72076115104.pdf
    • http://traiteur-ribot.fr/userfiles/file/41715905609.pdf
    • http://fatename.com/uploads/files/202109182041458331.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=cherry+browser+apk+download
    • 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_off0000b18a.bin
46d749e4a456e13e287d47dcbc56af4994df0df85fd1ca4742cbeb9d11660e5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB18A 10760 bytes
font_01_sfnt_off0000ca20.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA20 16792 bytes
font_02_sfnt_off0000e232.bin
d5758619612093b3ce5f980019d8b5ab53141882453eedf16ebd58c666fe27e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE232 14752 bytes

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