Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7da1d5e8fd4262…

MALICIOUS

PDF

84.4 KB Created: 2021-09-13 13:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1b86a8399e5d53edd52780b44194f625 SHA-1: f20f39c7fedc6cbd24795cfe10164a17d1b08180 SHA-256: ef7da1d5e8fd4262d8af4a611e3bc6849a36647a31fb737bdd6575f32938949b
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to external sites, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/42068616627.pdf In PDF document text
    • http://www.awakohchang.com/image/upload/File/5531818097.pdfIn PDF document text
    • https://ocw.tw/uploads/files/15545708074.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/73445438733.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/46351266740.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/65950469909.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/vowivomu.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/ranibomavavuxez.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/tavedomifa.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/bifaz.pdfIn PDF document text
    • http://one9five.com/userfiles/files/dufenirixote.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/fc8ad96f3ef7c9c49c9ee4c106b678a6/wesavuxu.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/14665191055.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/mifogakuzikej.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131a8c6aba38---dijivilobomeses.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/nuruluv.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/fexosuta.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/futedazuvutakim.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/10091289698.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/50535534310.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/dejatokikoxowenalano.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/34314266321.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/pepene.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=apk+game+canterPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21D 16104 bytes
SHA-256: 4204f4a647e3e8488fc3125e36d68471fcc515b787f7ef36a685bb1e406e82a7
font_02_sfnt_off0000f769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF769 10364 bytes
SHA-256: eca8af18ed77808395d094b1b8afe237007eb1cc03c588f5f090e5ce5b867c8d
font_03_sfnt_off00010ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDE 20624 bytes
SHA-256: 1663912ccd4d3c7dadb4bde4d51ddadcb939a4d8182fa8e823a2027596322bd3

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