Malicious PDF — malware analysis report

Static analysis result for SHA-256 c94677fb69d7e718…

MALICIOUS

PDF

75.6 KB Created: 2021-09-19 09:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 287e45003655de8a80d591c3b1d156ca SHA-1: 029b07110285bc1bca1c6b5acd344c820044af46 SHA-256: c94677fb69d7e718b079a0158943080272d8d469e2af4194c4e6dbc60cde2d96
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's used as a lure to redirect users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=yts+movies+2017
    • https://huuphongplastic.vn/uploads/images/files/nexaregadexosedosab.pdf
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/65683005521.pdf
    • https://sabagdasarov.ru/upload/file/livogeriwutox.pdf
    • https://greenfuturevietnam.com/Upload/files/rebaxo.pdf
    • http://vinhomeshaiphong.net/app/webroot/img/files/3342220759.pdf
    • https://tramhuonghanoi.vn/upload/files/siperevasojozid.pdf
    • https://hygradeinsulators.com/images/uploads/file/muruberewezumazonomuzude.pdf
    • https://mujeresenmovimientoplus.com/userfiles/file/44942468394.pdf
    • http://dasbluemchen.com/88446315727.pdf
    • https://mmoxx.mn/userfiles/files/migurunokevaz.pdf
    • http://noclegsosnowiec.pl/eurostyl/photos/file/51030162924.pdf
    • http://poketomecam.com/uploads/files/taragek.pdf
    • https://budapestpainter.hu/ckfinder/userfiles/files/98022021531.pdf
    • http://abwgulfport.com/uploads/files/mitelaj.pdf
    • https://camerabentrenet.camerabentre.vn/ckfinder/userfiles/files/96281556645.pdf
    • https://hfbee.tw/upload/ckfinder_temp/files/20210914040152.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2e9037f71---59536315001.pdf
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/wozutevu.pdf
    • http://www.gieskestukadoors.nl/ckfinder/files/files/lanadolawuretadegagu.pdf
    • https://autoroman-service.ro/imagini_ws/73846074498.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/ad3807b86489434404ef80777516c73b/zabuza.pdf
    • http://darslaska.org/ckfinder/userfiles/files/25450616887.pdf
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/51247684153.pdf
    • http://kondicionery-lubertsy.ru/upload_picture/file/6199590518.pdf
    • http://domuran.pl/files/file/96300682983.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_off0000c5df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DF 16792 bytes
font_01_sfnt_off0000ddf1.bin
467e65af883a5f71a2ffa1f7bba463c39b9d0db89e3908fdb5df1697385d8a36		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF1 17260 bytes
font_02_sfnt_off00010adf.bin
55151482c021525fa7baa2d8b156babd2255766f012f7feb26e60adf8d0b960a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADF 10252 bytes

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