Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2c6eba87def2df1…

MALICIOUS

PDF

70.1 KB Created: 2021-09-09 13:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6621c8d621946d74baaab4884b09ed1f SHA-1: 5a64950aa45e3f7adcd81b6289581442ce7e4247 SHA-256: f2c6eba87def2df14e4bbbb78c711d537746aed8bd26ba11e09f6fb7da4fd0a8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to suspicious PDF files on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host multiple links on disposable domains. While no scripts were explicitly extracted, the PDF structure itself can host malicious JavaScript, which is often used to redirect users or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://accessprecision.com/userfiles/file/25535667165.pdf In PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95257799155.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/jademolowurozopufaw.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/gawoputaluruxe.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090705012273499.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/19455945244.pdfIn PDF document text
    • https://mmtours.si/uploads/6604490040.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ec1a9ac29---bitilururonevuzakenudude.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/84546867413.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/68271436231.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/papaxigo.pdfIn PDF document text
    • http://ruresept.ru/files/file/12826188268.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/98756605872.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/dazazebimunaba.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/tekuwezorikam.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/vokoxafovisabojowifepuku.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/90852158253.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/72270612800.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161317fb00f23c---zozamevon.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/godazanodenuzedesikid.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/nifikaxujimif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=extreme+call+blocker+appPDF 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_off0000b259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB259 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA70 10488 bytes
SHA-256: ab1e47ec088a454f44a318abcc97d4b316e4455be81715845bd11f7d34e87318
font_02_sfnt_off0000e21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21B 15780 bytes
SHA-256: 3d40aa394e2f0d09201c8d2d96841b2de28c942613cf0c5f010137f247fb5e89

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