Malicious PDF — malware analysis report

Static analysis result for SHA-256 5570577b43b4e889…

MALICIOUS

PDF

68.5 KB Created: 2021-09-17 04:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cad42143f0cb2d997c2dab5a1f8b0373 SHA-1: e5b91b0ea41ec29b106539b31069aa8a336dcd51 SHA-256: 5570577b43b4e8894f9fabf301f970e5d4f89c1782c77bf2e8fef726e1ccb3fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to unknown domains, suggests a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a link farm strategy, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.elstar.ru/uploads/files/56573810557.pdf In PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/motanalixomabubekel.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/berona.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/19823880136.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/nuxorigozirodamukedod.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/vizima.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/kamonowerivutitapo.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/zekatatuminibevegirevawez.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/51811318287.pdfIn PDF document text
    • https://ijp2.com/contents/files/vimofodetula.pdfIn PDF document text
    • https://maths-pdf.fr/ckfinder/userfiles/files/vutidepuzanulov.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/wolulejuxupuf.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/kigupomixaraderike.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/vegarizazub.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/34141499613.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/vogiru.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/jifodimab.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/30631181848.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/43952813791.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/nosasorejupijirutebetaze.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4e29d701c---vejoduxakozimuvowa.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021090605193536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=stalking+private+instagram+profilesPDF 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_off0000af5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF5B 14496 bytes
SHA-256: b12d2a4d3cac94eb6d141b83211a8927cb4616a3e2c869ba139778ca57a2fe35
font_01_sfnt_off0000d36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB85 10936 bytes
SHA-256: d30efe3afe5abc8139759d3f951723d8a91b96618a14516ab05ffc1760b4c196

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