Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ada6ff7e9a3e747…

MALICIOUS

PDF

78.8 KB Created: 2021-09-20 02:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 427c6d3e3dc11da016f07508ddd6db43 SHA-1: 5b49529fee04a617d5fcbde17096aec4e0a53ace SHA-256: 6ada6ff7e9a3e7478438674c4fd69c0e179bea94983103294f350bf4d241db1d
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of multiple PDF_URI heuristics and the ML_NYX_PDF_MALICIOUS firing strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=osu+mania+on+android
    • http://okuninka-biale.pl/userfiles/file/tasixudugikinazidoxos.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613281cbef66a---pibavubugudud.pdf
    • http://chukgoobok.com/files/fckeditor/file/damuzejofevirovixewozajus.pdf
    • http://fittbikese.hu/files/file/pininopalimopebopibapen.pdf
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/83325944801.pdf
    • http://fsnmmaterials.com/UPFILE/userfiles/files/kinulonizaxoxemufonere.pdf
    • http://alacarte-grafik.de/userfiles/file/saxewuniwakul.pdf
    • http://prompol.com/media/file/zunebipodetepixidi.pdf
    • http://tryinvest.eu/userfiles/files/25149574084.pdf
    • http://futuralagoparking.eu/userfiles/files/xezovanaguvekuro.pdf
    • https://mcdelandes.ca/uploads/file/17477487363.pdf
    • https://biomedchita.ru/imeg_master/file/48277393787.pdf
    • https://suma.ca/upload/editor/file/22178523600.pdf
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/9024663490.pdf
    • http://studiocastigli.eu/userfiles/files/30867173746.pdf
    • http://milkexim.ru/imgeditor/file/mixozowapo.pdf
    • http://camberwelltaxi.com/survey/userfiles/files/40174018730.pdf
    • http://sportingclubalbinia.eu/userfiles/files/93255871186.pdf
    • http://fcgo.tw/uploadpic/files/ligatikafotumusiw.pdf
    • http://alacarte-grafik.de/userfiles/file/xotexixozogibodubaxaluter.pdf
    • https://simplehome.ro/ckfinder/userfiles/files/vebitejirikisuxojiwexaw.pdf
    • https://wfbulgaria.com/uploads/wysiwyg/files/42262974243.pdf
    • http://delfosventures.net/userfiles/files/bomixopovudeseg.pdf
    • http://tnslib.su/userfiles/files/81213199.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_off0000cb68.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB68 16792 bytes
font_01_sfnt_off0000e37f.bin
8189f55bec8886e88be82e210aaaf77b35450db24ef2f9545cf7ce090314b359		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE37F 10260 bytes
font_02_sfnt_off0000fa6f.bin
610b5bb2163b4d4eea1802edd5c22dc3fc3094ae201a662c8c0425f8b7118e99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6F 19500 bytes

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