Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f892b0e210d7e4e…

MALICIOUS

PDF

80.3 KB Created: 2021-10-12 12:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5a871c4e0476b96d86ffa12514a1e7e0 SHA-1: eb57fe06af2b1f114c129bb73af1680c638a334e SHA-256: 2f892b0e210d7e4e7ddd6f73f97b4591e44c04707d2b2f5324fb5158cd82fb2c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious PDF files on various domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links are characteristic of malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://ahirealty.in/admin/userfiles/files/20221920576.pdf In PDF document text
    • http://formacio.fic.cat/uploads/file/fusadazoxobozi.pdfIn PDF document text
    • http://newworldss.com/uploads/file/84976547920.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/51276717012.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/27376280101.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/todonowixukugazo.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/wilugupuwomojuru.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614841e61340f---datufuzopuf.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/99341801513.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/39899724794.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16160f5993b481---punibakifol.pdfIn PDF document text
    • https://andhimazhai.com/images/files/dipinovigujabelanel.pdfIn PDF document text
    • http://livestocktool.com/d/files/24408453431.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/72010225651.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/10237899073.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/54927634879.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/wefediduxererijit.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/baxib.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210915_2CE211D2FED845E3.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/10942710037.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/zeleve.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/toweda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/1hHberoKktI/uplcv?utm_term=after+hours+watch+onlinePDF 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_off0000d432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD432 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC44 18176 bytes
SHA-256: 5bc1a6ea31a6464b827d708d3b1a76030c0c098374bf337e324b54af0fb90be9
font_02_sfnt_off00011b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6D 10600 bytes
SHA-256: f6a78e6784de6069191e7fa627a3387985c5e6090c63d7c472c19bfb673656e5

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