Malicious PDF — malware analysis report

Static analysis result for SHA-256 769e55c244472065…

MALICIOUS

PDF

75.3 KB Created: 2021-09-18 08:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a06acdbc68f4a1befe366378f1d48e8 SHA-1: 8f951ab49a0576656f34c3dd388c3f6d8ee4e1c7 SHA-256: 769e55c244472065ceee01ff00089751a5519c3b7f3a34beeeb51952bf6bac23
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed as a link farm, pointing to numerous distinct domains. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic strongly suggest a phishing or credential harvesting attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://lustigersteirer.at/userfiles/file/rutajedimikigirejavuduj.pdf
    • http://markasib.ru/ckfinder/userfiles/files/govigipaz.pdf
    • http://improntediteatro.it/userfiles/files/82789267438.pdf
    • https://icbacademy.com/upload/files/9934420403.pdf
    • http://isystemlab.com/admin/ckfinder/userfiles/files/67230122355.pdf
    • https://laughteronlineuniversity.com/images/upload/files/zimidajugexudoboxajiwutu.pdf
    • http://wohingltd.com/userfiles/84680515666.pdf
    • http://phuvuongcorp.com/luutru/files/95752756533.pdf
    • https://www.iieng.org/editor/ckfinder/userfiles/files/gatifasaropudafilefa.pdf
    • https://sainaudit.mn/File/79938364544.pdf
    • http://thermcom.cz/userfiles/file/lemakoxe.pdf
    • http://woodwaysindia.com/uploads/ralopinupa.pdf
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/71769800844.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415007302d5---16097096601.pdf
    • http://gesundezellen.com/neu/userfiles/file/jizerimadelobovabogadeg.pdf
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/72167268580.pdf
    • http://starinviter.com/ckimagefiles/xapebitofaragobaxe.pdf
    • http://ancient-theater.gr/media/file/44158732659.pdf
    • https://hyosungulf.com/uploads/file/80146691014.pdf
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/xijex.pdf
    • http://nazycakes.com/userfiles/file/99572312312.pdf
    • https://karpataljaturizmus.hu/upload/73285196847.pdf
    • http://tjsyjdq.com/v15/Upload/file/20219161835323627.pdf
    • https://taxforce.nl/userfiles/files/19259651301.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=altimeter+for+android
    • 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_off0000c2f0.bin
8ddbfc1dd4a92be788ee103a7d366608c71fb7ab0fa474788ba93651b896da66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F0 10328 bytes
font_01_sfnt_off0000da26.bin
024c26e96dcce481dcbd62c477e95a01d986a649019afb96f020957e9c9b2d3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA26 17480 bytes
font_02_sfnt_off000107a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107A4 16792 bytes

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