Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb4caff4e94868a1…

MALICIOUS

PDF

70.1 KB Created: 2021-09-12 06:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b97d0e15cad92f5a08ad91fe69522f98 SHA-1: 3ca6b2800810ea83c4fc3827a4903d61e7832fec SHA-256: cb4caff4e94868a17822b379bbc0c964635672bfc82d816381390cbcc00b59e4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to disposable hosting, indicating a link farm or phishing attempt. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies this pattern. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://allytemp.ru/uplcv?utm_term=how+do+i+get+siri+on+an+android
    • http://irvinenott.co.uk/ckfinder/userfiles/files/72879927158.pdf
    • https://rt-totaalafbouw.nl/userfiles/file/64607379501.pdf
    • http://www.hausman.eu/images/wyswig_images/file/danad.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/50610579939642d0e2801f2b2f8ca980/nixomugopili.pdf
    • http://associatedreclaimed.com/userfiles/files/67181815860.pdf
    • https://hiroyoung.com/data/files/gawetasogunasofozekido.pdf
    • https://b2cexpressdemo.com/userfiles/file/26720158849.pdf
    • http://tuderprogettazione.it/userfiles/files/70261519389.pdf
    • https://npkfertilizerproduction.com/d/files/dosapinunujupeguxoto.pdf
    • https://asmitahrgroup.com/ckfinder/userfiles/files/kujupuwupani.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161355e8745403---poxev.pdf
    • http://cathyknightwaite.com/ckfinder/userfiles/files/70042433582.pdf
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/65441523032.pdf
    • http://morethancars.nl/uploads/edytor/file/jodasiga.pdf
    • http://urbancollab.com/userfiles/Proj_Name/files/67806191809.pdf
    • http://metallpress.ru/files/56816776141.pdf
    • http://metapolar.hu/tmp/6515862401.pdf
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/ragelis.pdf
    • http://ecohort.com/userfiles/files/xufusedoguxigesag.pdf
    • https://xylemleads.com/userfiles/file/wafunitova.pdf
    • http://yh-nutri.com/filespath/files/20210901145049.pdf
    • http://irk-yoga.ru/upload/files/kopibizoxodoji.pdf
    • https://upaspor.com/resimler/files/segekawavunukul.pdf
    • http://hyundaiokla.com/uploads/files/61322412372.pdf
    • http://fkhd.cz/data/img/wabumemijekukopol.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_off0000b3f6.bin
43b675174122b4a6993b487d98a595364a0f88d4c8e872c6f1c4b0d0eb95f311		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F6 15576 bytes
font_01_sfnt_off0000db8b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8B 16792 bytes
font_02_sfnt_off0000f3a2.bin
252beb81089f597feff93ec991af6f93f4393b1887774e1d13d6c4e1ebf850a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A2 10456 bytes

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