Malicious PDF — malware analysis report

Static analysis result for SHA-256 e73832f6767162b9…

MALICIOUS

PDF

71.2 KB Created: 2021-09-24 21:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3a64a5f14df4898cfc1781a5f5e68ce4 SHA-1: c9e2d4eb4c237d328e177488bc0239251dae4d5e SHA-256: e73832f6767162b98304a04862ee170e5bfc1ba5d5ee40e7e1f12445c80cfae7
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 that these links form a link farm, likely for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, with ClamAV identifying it as Pdf.Phishing.Trojan. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malicious content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://dmhu.eu/uploads/uplib/file/xekixorenot.pdf In PDF document text
    • http://studioarclab.eu/userfiles/files/jexugenitavoxisafa.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/76262811712.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/nofexusawavo.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/besujokakumozitan.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/77074223612.pdfIn PDF document text
    • http://a899.net/userfiles/file/79502510608.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/bixevatuwiranef.pdfIn PDF document text
    • http://imoroz.by/upload/file/dikigulogabus.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/22028392061.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/limev.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612f79a5114a9---24366413741.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/wifofupinevazojoliso.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/zutipipugaxovozekabeko.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/tabejimaf.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/33675645195.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/9831921134.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/nedutizaduvogejuxam.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16130c78b67fef---76722397222.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/92899623825.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16137b4992e0ef---44424138409.pdfIn PDF document text
    • https://matratva.in/userfiles/file/36582432310.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=who+viewed+my+instagram+websitePDF 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_off0000b2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D7 11048 bytes
SHA-256: 1834ef42ba082940e59abf2a6c3197c771d17adbffb55b5bdc960ab283b20ac1
font_01_sfnt_off0000cc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45A 16880 bytes
SHA-256: aee7d3f43350b18da6bb3a69c3fced07f78c956e03ae81628cc63666f2a08c5c

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