Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eae459791a25008…

MALICIOUS

PDF

83.6 KB Created: 2021-09-17 09:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2676710bbac13221811fa13d73cfef72 SHA-1: 5f2b456436819094d3222ac32ed2d3c3ff86c9fd SHA-256: 6eae459791a250086d5fd8464bc71bb89f087a555b8ac7e87b933a4adc09274f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to PDF files hosted on various domains, suggesting a link farm or distribution mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the nature of these links. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/53045647525.pdf
    • https://dlt-nkp.com/fileupload/file/gewuzijevufelomu.pdf
    • https://hygradeinsulators.com/images/uploads/file/wisazofasonuk.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1614118d92661a---87895115632.pdf
    • https://aglogistics-bo.net/userfiles/file/noxiwemimab.pdf
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/1394025495.pdf
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bikekopegojewedav.pdf
    • http://theclubburger.com/uploads/files/44499430470.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa76ebb00d---37385197092.pdf
    • https://cardolf.ro/files/85896819072.pdf
    • http://paraglider24.de/pics/fotos/1/file/zoliravo.pdf
    • https://duocvinhkim.com/userfiles/file/16368591608.pdf
    • http://stressmanagement-karriere.de/userfiles/file/sevutenexikabip.pdf
    • http://laxycoffee.com/upload/files/63045853434.pdf
    • https://qwert5.com/psum/admin/userfiles/file/44297870468.pdf
    • http://tochuchoinghi.org/files/42825967109.pdf
    • https://ikorti-iao.com/userfiles/files/77665391407.pdf
    • https://kimcert.org/E/file/penitosu.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161304b58041ab---ropet.pdf
    • http://www.pes.edu.mn/ckfinder/userfiles/files/64920347104.pdf
    • http://full814.com/upload/files/41685772423.pdf
    • http://ecilingirler.com/resimler/files/rupexudimo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=best+7+inch+tablet+2019
    • 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_off0000e20b.bin
b599cb881dcfb9a48018fd25ac7911d34ba89a8ef2ba6f989011d84890a59fb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE20B 17728 bytes
font_01_sfnt_off0001102a.bin
88223ccbb6579f7993738ed717c32557206dbfb7323b3982f34bbec01ca948a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1102A 10812 bytes
font_02_sfnt_off00012932.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12932 16792 bytes

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