Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6492ee6f33768c3…

MALICIOUS

PDF

69.1 KB Created: 2021-09-28 11:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e680b18d2cce306a8b4af4a52cff336e SHA-1: 3d6995060515a161274d8f3aa31c28f58fb3195c SHA-256: e6492ee6f33768c3203bffd753ecf38a56f30325481d527c5043ab40c5d8a7f1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to unknown or potentially malicious domains, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to external sites for further compromise. The file's structure as a link farm on disposable hosting further supports this assessment.

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 https://kuepancong.com/contents/files/26718747968.pdf
    • http://artechq8.com/beta/uploads/files/99036394109.pdf
    • https://bluetact.com/ckfinder/userfiles/files/riravemipovabukiwita.pdf
    • http://consol.hu/images/uploadedimages/file/tekapuzijamafokaxevejava.pdf
    • http://boilerservis.ru/uploads/files/kakeripanajuro.pdf
    • http://fivelscope.net/fckimages/rusositomimevugol.pdf
    • https://sportuna.be/ckfinder/userfiles/files/pixudijonavelupep.pdf
    • https://clumba-indoor.ru/files/files/kujox.pdf
    • http://dermatologomiguelgallego.com/miguel/fck/file/61782899919.pdf
    • http://wsp.pl/userfiles/file/risijuderaniz.pdf
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/nebodalosotizogoseludu.pdf
    • https://stcc-sa.com/motakamel/Ups/files/92427023976.pdf
    • https://maritime-models.com/userfiles/file/razaxisexekatevulutoke.pdf
    • http://telecycling.org/files/file/zisisalojijizuxawi.pdf
    • http://jenan.com/ckfinder/userfiles/files/83046730540.pdf
    • https://kidneystonetreatment.in/userfiles/files/8455162121.pdf
    • http://marjoleintje.nl/include/userfiles/sirumevigak.pdf
    • http://agro-norwa.pl/userfiles/file/31239422473.pdf
    • http://abwingsbuffalo.com/uploads/files/pusipixufizemi.pdf
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/zefeselol.pdf
    • http://contextuae.com/resimler/files/35784712162.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/40bsm64qaq7e6i404b1njdb051/lekeropa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=miui+12+sim+card+problem
    • 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_off0000ad47.bin
b8b6680f2b3b25643f1d8683e458872d95cf798dd08c57a7e9b5ab5798ca95e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD47 15668 bytes
font_01_sfnt_off0000d4f6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F6 16792 bytes
font_02_sfnt_off0000ed0d.bin
35bc29c43521ef5eaaaed9b0d00c976fdc29720e2e36988eabebb0ba7462cb43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED0D 10880 bytes

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