Malicious PDF — malware analysis report

Static analysis result for SHA-256 17ca7c7b55c839e5…

MALICIOUS

PDF

78.3 KB Created: 2021-09-18 10:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dc594f59496f1a37a8ece8fd2f09d708 SHA-1: 4767b7b76706cb681ac75285886e12f04914b295 SHA-256: 17ca7c7b55c839e5790e5d278ff880f3737763c9aa942c416e474436254c82b6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to various external sites, one of which is hosted on studio45.live. This pattern is consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://studio45.live/wp-content/plugins/super-forms/uploads/php/files/cuiguagokj6ua3jami1h4ddpvs/murukuwuzuluxafotomugi.pdf
    • http://daglichtfilters.nl/ckfinder/userfiles/files/67195312161.pdf
    • http://multiflex.ru/userfiles/file/voregaratilomibeniluf.pdf
    • https://ceiling.holcom.vn/webroot/img/files/59717972426.pdf
    • https://daulte.ch/ckfinder/userfiles/files/29213244144.pdf
    • https://romalasergroup.com/userfiles/files/fitegu.pdf
    • https://malinaionescu.ro/userfiles/file/titozevajalivuxusuvog.pdf
    • http://ski-experience-japan.com/images/blog/file/95939977412.pdf
    • https://preprodpcb.com/userfiles/files/boruw.pdf
    • http://ros-grad.ru/fck_editor_files/files/rudonalajaridimojabagitir.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/4dpalr2dob881hqlhnaeq3ucik/12046619945.pdf
    • http://sisparts.pl/zdjecia/fck/file/buzumuwuvolatesomurotoxon.pdf
    • https://beamstraffic.com/amb/userfiles/file/jolasexidesowas.pdf
    • http://archiw.gbpopatowiec.pl/img/upload/files/nokujomoka.pdf
    • http://zaiger.ru/img/file/xalilojatipimirav.pdf
    • http://duhochoangthanh.com/upload/files/22212610198.pdf
    • http://marklaliberte.com/fckupload/file/vefelosuzigusuw.pdf
    • http://phuwangnam.com/user_file/file/87886785792.pdf
    • http://www.gieskestukadoors.nl/ckfinder/files/files/zedijumegofujefe.pdf
    • http://yetisirkaucuk.com/firma/files/fimeragugifijivege.pdf
    • http://cka-shiba.com/ckfinder/userfiles/files/zobatejilegin.pdf
    • http://stigstudiotecnico.it/userfiles/files/11755251859.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+download+free+fire+new+update+under+50
    • 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_off0000cdc7.bin
2362a96e3bcabb8079f17b83e0285529c9c0f5b8474c4e0d430dfb1168556487		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC7 17436 bytes
font_01_sfnt_off0000faea.bin
672bf8bf961ba6d812e013273c264254466625c24e6067f2e544599a1555e293		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEA 10756 bytes
font_02_sfnt_off000113c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113C3 16792 bytes

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