Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ae2b1d99b5273b…

MALICIOUS

PDF

80.6 KB Created: 2021-09-28 02:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9cfe6f51f6b37195d47ceab5d26ba8b4 SHA-1: b297ecb5a1e5d7a6cf9153a5e6ebe4010e9a0ec8 SHA-256: c5ae2b1d99b5273b05e4763b8dd1172d7280b7faf71f471c4d8031e6f41e88ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, many pointing to potentially disposable hosting, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://it-hair.com/userfiles/zimege.pdf
    • https://campermagazine.tv/public/file/paborebafizirowivaga.pdf
    • http://ilyxrace.com/userfiles/files/gusanafoxewagepaxinegitid.pdf
    • https://goooinggroup.com/userfiles/files/20210921_064842.pdf
    • https://pensionradvanice.cz/res/file/nurusiwadonojipezujeda.pdf
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/33336057897.pdf
    • https://cancelaria.pl/galeria/file/wonaxopix.pdf
    • http://taihegas.com/filespath/files/20210912232703.pdf
    • http://www.gonouvellezelande.com/files/nefusirazapevapepoda.pdf
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/28163887177.pdf
    • https://hotelexpert.ro/uploads/files/zajidorena.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161524d0b86467---76391087239.pdf
    • http://www.agenbenangbandung.net/file/xidinezog.pdf
    • http://greensketch.in/userfiles/file/33276171252.pdf
    • https://xnkvinatimex.com/uploads/files/lerozotawiwenez.pdf
    • https://jkmart.net/FCKFiles/File/nuvopatijenudomewini.pdf
    • http://oilmachineydy.com/d/files/79595290766.pdf
    • https://presstone.hu/userfiles/file/talugujovixada.pdf
    • https://szekszardportal.hu/userfiles/file/85998376807.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/858f97b3b4ace3e4c2ad2a24f2af01e7/rokeporipuv.pdf
    • http://locum-system.pl/userfiles/file/wirig.pdf
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/kaduzopilumipojumelusire.pdf
    • http://zensushidanapoint.com/uploads/files/teganaposu.pdf
    • http://designbeginnings.com/upload/file/sagamo.pdf
    • http://studiorapizza.it/userfiles/files/29675231200.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=android+telefonu+g%C3%BCncellemek
    • 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_off0000d40a.bin
33c68c33cf1f91229865de5244e155a088d212192eb78720de41bf0ee9906bee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD40A 18492 bytes
font_01_sfnt_off00010233.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10233 16792 bytes
font_02_sfnt_off00011a4a.bin
c5b36faaeb9e26cae9e28f58484fc117f4782f597d3614bbfac3a565b46996c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4A 10856 bytes

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