Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a58ff11b4a0abb9…

MALICIOUS

PDF

73.1 KB Created: 2021-09-16 08:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5903dee435cd29f7581a07d229b8b576 SHA-1: 9f6b25d49e7064fbf99f8d201c3809bf5809788e SHA-256: 4a58ff11b4a0abb9c06ae6e977118d3a41345f82b18b2cb5d28de52082a34a21
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs that point to a link farm hosted on disposable domains, likely intended to redirect users to malicious content or malware downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://oniceh.ru/uplcv?utm_term=naruto+ultimate+ninja+storm+2+free+download+for+android
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310b0af1415---vizuponapomiwalifibejitew.pdf
    • http://avandcie-automation.com/ckfinder/userfiles/files/rujonebemifibixidujozuvu.pdf
    • http://motivationandmomentum.net/ci/userfiles/files/sorodorasaloxasexozibu.pdf
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/64939109595.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfd641cc30---79533511191.pdf
    • http://bitree.net/ckfinder/userfiles/files/nipikomebazunukesu.pdf
    • http://getampedmag.com/ckfinder/userfiles/files/ripazajupirava.pdf
    • http://flywings.sk/UserFiles/file/2173820659.pdf
    • http://studiosiciliani.eu/userfiles/files/rixixurifixug.pdf
    • http://ros.by/ckfinder/userfiles/files/kitufevebezulonewixigovin.pdf
    • https://intersat.lv/files/file/jefomegu.pdf
    • https://abouelhoulgroup.com/userfiles/files/57876251929.pdf
    • http://myphammonly.com/luutru/files/kuxojejozabaruwup.pdf
    • https://alpinashop.bg/files/4576686923.pdf
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/kipofijus.pdf
    • https://aneri12.eu/res/file/93655915279.pdf
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/58960249003.pdf
    • http://aa-nusd.jp/9292627753.pdf
    • https://btegypt.com/file/29306359199.pdf
    • http://mestav.sk/uploaded_images/file/71339867206.pdf
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/37418755026.pdf
    • http://geomanteia.com/userfiles/files/padudigemitusuninabajuwe.pdf
    • http://cualuoiskydoor.com/webroot/img/files/65787404630.pdf
    • http://lasermedia.cn/userfiles/file/63727219496.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_off0000bb2e.bin
4a486f46d56b2e4f20f200c7434d330f02acbcf8208faf8a1a46138a82b2c025		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB2E 10928 bytes
font_01_sfnt_off0000d48e.bin
741b51df87a10da4e9afa66a625792c628bf229511045f501f491dfecfedbdb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD48E 16300 bytes
font_02_sfnt_off0000fe57.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE57 16792 bytes

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