Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f9cebd1546e579d…

MALICIOUS

PDF

83.4 KB Created: 2021-09-10 11:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c64402d14aed1f9f8be6b9a685538394 SHA-1: 47fb2b38b921d6906c036e6eab77939793b6a1cc SHA-256: 7f9cebd1546e579d73ee415614e2dea2c27e678a3df8b86372bcc5c2e9267027
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 hosted on various domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of link farming on disposable hosting, suggesting an attempt to obscure the true malicious destination. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its structure and embedded content designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://okgwa.net/50/files1/file/fuzamodamalofobopizudo.pdf In PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/30711560332.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/zaburer.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/kusinagu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/222341e7fa33a3c85710a58e99f3dd5a/sutaretevekawedex.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/zemukaz.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109071536009955.pdfIn PDF document text
    • https://petek.biz/resimler/files/86678843250.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/danuzamolozilexexigitolem.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/jevegoresinujefa.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/70159035472.pdfIn PDF document text
    • http://355353.ru/userfiles/file/56879515630.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/sajewagolukak.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/59993054847.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/29690031151.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/38821368107.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/92987657359.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/98834270421.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/74491815192.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392d264da03---4934161209.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/kotewuzosabima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=screen+link+for+androidPDF 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_off0000e276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE276 18040 bytes
SHA-256: dc84480fcfad4667f8c6538225c6b65e07b1d48af014ab8a9270b822fb0993f3
font_01_sfnt_off0001105a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105A 10372 bytes
SHA-256: a1dfc58b3c74e4e2273914c0dba34a4e41e264d961be3d35d472f980e9564ef7
font_02_sfnt_off000127db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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