Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4fcc7627f65821c…

MALICIOUS

PDF

76.3 KB Created: 2021-09-26 14:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7aa6799b9070f2daaac3d95ef3f6dd1 SHA-1: fb182a699da822105ceacc275462962fa0b0c9fb SHA-256: e4fcc7627f65821c04a3792559f3f2bba5fda065b60df015475051dd8e30f479
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure, likely intended to lead users to malicious websites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://ketchas.ru/uplcv?utm_term=supah+ninjas+123movies
    • https://bushregenerators.info/userfiles/files/16554571946.pdf
    • https://garnet-medical.com/userfiles/files/zegina.pdf
    • https://gberwanda.com/gbe/useruploads/blogs/files/divodavorilekapulu.pdf
    • http://stroykap.com/application/views/stroykap/userfiles/file/35393982796.pdf
    • https://happyfun.tw/uploads/files/202109012117559446.pdf
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/16666639208.pdf
    • https://dintek.eu/uploads/file/nexor.pdf
    • http://mosjob.ru/images/file/29638444301.pdf
    • http://csc-vietnam.vn/uploads/userfiles/file/97412639856.pdf
    • http://rintoyo.com/userfiles/file/39881951736.pdf
    • http://isleford.com/filespath/files/20210920125738.pdf
    • https://123natura.com/stockages/files/maluvax.pdf
    • http://krajinar.cz/soubory/files/nugolo.pdf
    • https://mudraconsultancy.com/uploads/files/rexakaxumunopubival.pdf
    • http://kingtonkatsu.com/uploads/files/61408339991.pdf
    • http://hoaphathotel.com/luutru/files/dosumoxoxutepojagew.pdf
    • https://abctranslink.com/ckfinder/userfiles/files/mebaroku.pdf
    • http://lonsdale.ee/tipikas/uploads/sisupildid/refenorukoto.pdf
    • https://ahirealty.in/admin/userfiles/files/gifexibamoxava.pdf
    • https://swaarm.de/app/webroot/upload/files/76230314810.pdf
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/tupozagoku.pdf
    • http://smolensk-bakaleya.ru/userfiles/file/dexibonibu.pdf
    • http://www.cenlafilm.com/siteuploads/editorimg/file/32244958086.pdf
    • https://leciv.fr/uploads/FCK_files/file/gojojoziguralimexoxag.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b226.bin
46c83662631d7eea62726c9799f0f031afe903f20831f8954f49fd9b0d8ef010		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB226 15132 bytes
font_01_sfnt_off0000d7ad.bin
ab5402980d1ea7d6ed3dc1b6e31bd88bca16d04467df283efa19faa806a899cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AD 10988 bytes
font_02_sfnt_off0000f109.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF109 16792 bytes
font_03_sfnt_off0001091a.bin
cc7e9369bb8ec0a7375f8766fdaf20d241c286aa54bf684c8ac71874d1f1bc10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1091A 17704 bytes

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