Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5ec37505da5c72…

MALICIOUS

PDF

70.0 KB Created: 2021-09-29 08:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a082f9e7dac248623719e0670df4bb1c SHA-1: 9c169048aa46cc2de82a23437551e0ecea2d28e1 SHA-256: cb5ec37505da5c7290e9a9fe8a8b27abdbe480bbde896e2050cad22246bb02bc
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to a link farm, suggesting an attempt to redirect users to potentially harmful content or to obscure the true destination. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a structure designed for obfuscation and potentially malicious hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/79296742857.pdf
    • http://www.sun-green.eu/ckfinder/userfiles/files/55029948740.pdf
    • http://marsalanoleggio.it/userfiles/files/fisufotonisetagukuraze.pdf
    • http://thietkewebbacninh.com/webroot/img/files/laganufuvotimizurozuw.pdf
    • http://superazs.ru/images/news/file/6664513639.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb251eeb44---74265489190.pdf
    • http://huabulaw.com/uploadpic/2021-9/file/2021090716563373499.pdf
    • https://renetravel.ro/images/files/4668048784.pdf
    • http://trans-serwis.com/userfiles/file/62513320969.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/73a96a67ebbb14f46fbfc57e198fa9dc/kusavizotidamuxinozagak.pdf
    • https://coherence.cz/userfiles/file/26051625964.pdf
    • http://avanti-kuhni.ru/upload/files/pefat.pdf
    • http://mkbeauty.vn/luutru/files/bemekofafuf.pdf
    • http://rothemtour.com/FileData/ckfinder/files/20210913_49F45C21720EAA14.pdf
    • https://chsins.tw/uploads/files/202109121503378590.pdf
    • https://shiokuda2.com/contents/files/zebekatudaruz.pdf
    • http://www.andreapondika.cz/file/15883423.pdf
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/doxevudarilumos.pdf
    • https://kitchensofdiablo.com/upload/file/28997639153.pdf
    • http://pol2-simf.ru/userfiles/file/wigapuravoviva.pdf
    • http://huntland.hu/upload/file/falikogitiwezekutalaga.pdf
    • https://fitness-sport.it/userfiles/file/88709602330.pdf
    • http://mgrima.com/files/file/sijediradoxemisanilusogi.pdf
    • http://123podkrovie.sk/editor_uploads/files/larafobivolevivaririjid.pdf
    • http://ahzycw.com/upload_fck/file/2021-9-17/20210917135053202008.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=waar+full+movie
    • 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_off0000b160.bin
bdbc70863922064b710772329d4ec904ef9525b4d45916898dcc64cf703e4457		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB160 10164 bytes
font_01_sfnt_off0000c81c.bin
e84610df54e719c53f44f463e7a9bc5e6fa913873fdb28bb73061311f4526f3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC81C 16644 bytes
font_02_sfnt_off0000f2b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B1 16792 bytes

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