Malicious PDF — malware analysis report

Static analysis result for SHA-256 b065d6200b350eb7…

MALICIOUS

PDF

68.7 KB Created: 2021-09-26 21:27:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ebdc7d72ff042997d69538a81f319df SHA-1: 69a3d66bc0fa3327a4c719e22c30c8f0aff9006c SHA-256: b065d6200b350eb7ca3fa075d94978d66c409fc77baa276bb959435f15c35fd7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The file contains numerous embedded URLs pointing to disposable domains, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farm characteristics further supports this. No scripts were extracted, but the PDF structure itself is used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://garglob.ru/uplcv?utm_term=algorithm+k+means+clustering
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/95047607262.pdf
    • https://wic-net.com/userfiles/file/kowoja.pdf
    • https://yogaspotny.com/userfiles/file/laxosojubupexijisu.pdf
    • http://fortwashington.abwingsmd.com/uploads/files/bojikapagigikuborekubupem.pdf
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/gujotatululemituvujote.pdf
    • http://iktoktatas.hu/files/file/xafamiziburefanuzojixigo.pdf
    • http://homelife-superstars.com/image/files/rigozejelobamemijaraxuko.pdf
    • http://hftyby.com/upload_fck/file/2021-9-8/20210908152302171797.pdf
    • http://www.thaiboat.net/image/upload/File/22692443858.pdf
    • https://vientangluc.com/upload/files/70294093888.pdf
    • https://rakowka.pl/userfiles/file/zotilizesukubusosison.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16143041fadd86---duwomijulinerodired.pdf
    • http://yigang-lin.com/uploads/files/202109160701234465.pdf
    • https://ismet.com.br/ckfinder/userfiles/files/24769360640.pdf
    • http://say-international.eu/userfiles/file/vojaru.pdf
    • http://jandenzobv.com/image_uploads/file/rebegome.pdf
    • http://annabarons.lv/files/files/69318481871.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdce595d8b---87539481944.pdf
    • http://ky-auto.com/uploadfile/files/57882248521.pdf
    • https://francois-daulte.com/ckfinder/userfiles/files/22253926118.pdf
    • http://teleinwestor.com/userfiles/file/gixitaxed.pdf
    • https://radekslodkiewicz.pl/files/file/23697480943.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_off0000ad84.bin
0c6e78921f20e83763c23fba09e814476a6f8ee87dc3e64438b5397bd4bad95b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD84 10852 bytes
font_01_sfnt_off0000c672.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC672 16792 bytes
font_02_sfnt_off0000de84.bin
67b284355ba346b695d4652b5131bcf170e5e1c536f04a26dfc43d0b7c31d759		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE84 15636 bytes

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