Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f6005e74be48625…

MALICIOUS

PDF

81.6 KB Created: 2021-09-13 19:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 179e38ddd51c438b502fb5631b1920e6 SHA-1: 29d003b7cb7d2c4735c590e6f0b7c6d757f6c79d SHA-256: 2f6005e74be486257fa904e75f5491ce5f253f01dafb55cb8e5518a05268f816
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or distribution network. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags the document as a link farm on disposable hosting, reinforcing the attack pattern. No scripts were extracted, but the PDF structure itself is leveraged for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://vanhacollection.com/images/files/kikarebirokupil.pdf
    • https://cli-kh.com/uploads/files/202109102144346665.pdf
    • http://se-ty.ru/uploads/userfiles/file/13229957357.pdf
    • http://pn-tech.net/userData/board/file/78440239484.pdf
    • http://ventmetal.ru/userfiles/files/67298457979.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/a1eecd0926db592ee0d929c112d58fdf/tubosedurigigopiw.pdf
    • http://splogservice.ru/content/files/vubapesasudof.pdf
    • http://abwlargo.com/uploads/files/notovavubewepapiforoxujet.pdf
    • http://forumts.com/ckfinder/userfiles/files/ripuwekakoxe.pdf
    • http://zwickerfoto.hu/_user/file/80306193233.pdf
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210910_BCD7A5345FECADE8.pdf
    • http://paolacaone.eu/userfiles/files/befulexetasowaso.pdf
    • http://hanlacsclub.com/ckupload/files/33588836978.pdf
    • http://kqcme.yiaiwang.com.cn/upload/files/8203969407.pdf
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tepozipawox.pdf
    • http://www.europesolidaire.eu/userfiles/files/gelidutesaxepiwupoxiku.pdf
    • http://tradotel-riviera.com/file/17854300534.pdf
    • http://www.reeder.ee/files/filemanager/51470372927.pdf
    • https://rallstarawards.us/nbloom/fckuploads/file/33607221801.pdf
    • https://ljlconst.com/admin/images/file/86575871009.pdf
    • http://dailymaytrogiang.com/userfiles/files/16262376314.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161314068a7c38---nojejasuxononekegoxul.pdf
    • https://mandarinkinesiska.com/userfiles/file/42943070940.pdf
    • https://shoppingplanet.ro/ckfinder/userfiles/files/lovulo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=madara+uchiha+live+wallpaper+pc
    • 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_off0000d9b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B9 16792 bytes
font_01_sfnt_off0000f1d0.bin
b0fbda47fe1450a9c006a46a191706b5bfff6f594227971b5dee556c8e86e77f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D0 10364 bytes
font_02_sfnt_off00010956.bin
1bcbe75866d331a568797da5c92f7e23703922d0271944093c74623ebc9633da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10956 18312 bytes

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