Malicious PDF — malware analysis report

Static analysis result for SHA-256 56a29f6be6ae5bf7…

MALICIOUS

PDF

68.2 KB Created: 2021-10-02 20:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed273de2e68af9b23652f966c35b9511 SHA-1: 2872402911be4c55d338390606e29381c4eaf2c7 SHA-256: 56a29f6be6ae5bf77661102ffa6b5dd3d803642eb07094f99e0726a2c37625ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://oniceh.ru/uplcv?utm_term=nicknames+for+people
    • http://pokebarslo.com/uploads/files/titakuwopapikotofovi.pdf
    • https://batikatravels.com/userfiles/file/sujovono.pdf
    • https://anandamsanyal.com/userfiles/file/zezapeped.pdf
    • https://konchris.com/userfiles/file/1631368253.pdf
    • https://decoveinvestment.com/userfiles/file/tifomag.pdf
    • http://www.herbertvanderbrugghen.nl/draft/javekebomobogazipi.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/f3f34ddd2fa940f08de49dff9e358b7e/jifeti.pdf
    • http://thunderstar.cn/userfiles/file/20210911042349386362167.pdf
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/rivapoxapefofetor.pdf
    • http://curry-box-deluxe.de/userfiles/file/zipivi.pdf
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/gasulefed.pdf
    • http://kpghomerepairs.com/uploads/image/files/labuwibak.pdf
    • https://momentous-inst.com/uploads/image/files/10899798095.pdf
    • http://michelschuurmans.nl/images/uploads/file/1816892922.pdf
    • http://akifkasaboglu.com/esatfisek/images_upload/files/63701389906.pdf
    • http://houtackers.nl/userfiles/file/61806101946.pdf
    • http://sportschoolindex.nl/images/uploads/juzipobasezafuwuzej.pdf
    • http://fujavietnam.com/images/Download/nazolusomiredexolo.pdf
    • https://pannonfinanz.eu/editor_up/98911723295.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/161426ae81b4a6---14682212865.pdf
    • http://cargologicru.com/sadm_files/muxofi.pdf
    • http://nepalbestcargo.com/userfiles/file/62886961016.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad65.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD65 16792 bytes
font_01_sfnt_off0000c577.bin
3db7d8b1778f92bf1a2f33ceeab0955c375d71bd58232b21a6eaa4f47cc42a17		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC577 15128 bytes
font_02_sfnt_off0000eb6c.bin
78f2b2ef5bff5c607d903b62c9ee05c50ddb5187cb336880a3de05e6b2599277		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6C 10612 bytes

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