Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ee92988772bb21a…

MALICIOUS

PDF

82.7 KB Created: 2021-10-08 00:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6b61d14086ee4bf7ac62bc21d93002fe SHA-1: 8c9514460bf850cc38d4301a7140a7f3dd23c0b1 SHA-256: 3ee92988772bb21ae7574508cc7a86a01a58fa6710500c346f3a005a9a11ecb0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which point to other PDF files hosted on various domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm structure, suggesting a potential SEO manipulation or content distribution scheme. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://semineebrasov.ro/printuri-fi/files/gizutudozuzije.pdf In PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/jowilawovodol.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/61304520385.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/83096547323.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/xaradivefopaw.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/nevanosojodipo.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/godarunigapegugopudatefof.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/13477851154.pdfIn PDF document text
    • http://moretonassets.net/userfiles/xuzaz.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69549659129.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/gegavivoloxajepujunufipo.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/rikavexuko.pdfIn PDF document text
    • https://twinscooking.nl/twins/userfiles/file/68049934574.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ef7842e68---21509204519.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/15201025418.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50771259104.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/gejom.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/muwaxepenik.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/waxasu.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/zupijaribukavibumala.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/kuvasofo.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/tofazipope.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/zemesosinapita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=layer+a+photo+on+top+of+anotherPDF 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_off0000dd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0E 10220 bytes
SHA-256: e7734b361a5223399e6ae38b245fef6829941f56f770805534b7fefd6adbbf1d
font_01_sfnt_off0000f3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EA 18844 bytes
SHA-256: 0371aea2fea5eb5db4fd0cbae852a1d8d2dcb9023d9058537a3118d9d5bfc118
font_02_sfnt_off00012567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12567 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1