Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3036fcb5ac1579d…

MALICIOUS

PDF

80.1 KB Created: 2021-09-17 05:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 606b01737a42f6b399091b563add7236 SHA-1: ab34c39e795446fafb4dedf97366372b1ce1fb10 SHA-256: d3036fcb5ac1579d2abb1aeca8bbc62323297acc7247613e84161fd7622de65d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://archism.ru/uplcv?utm_term=stream+demon+slayer+movie+online
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/98638600845.pdf
    • http://glampingcaravan.com/userfiles/file/20210909205037.pdf
    • http://tafgambiatours.com/userfiles/file/pozivi.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161392aeeb3961---65312513427.pdf
    • http://bhartiyambeohari.in/userfiles/file/koxadubutare.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/a42d6d3050f2cdd722db05acc5399727/juwijipiwobigiv.pdf
    • http://jucal.es/images/file/tabirujilefefariwip.pdf
    • http://kfbma.org/files/fck/file/99510266899.pdf
    • http://compsult.net/userfiles/file/88234729425.pdf
    • https://agriplan-rs.com/dados/ckfinder/files/xatemowusasisemavef.pdf
    • http://eastindiaspray.com/suvra/eastindia_spray/files/31751416579.pdf
    • http://tao-ssct.org/data/upload/file/rimegepi.pdf
    • http://salamino.pl/userfiles/file/fetel.pdf
    • https://dursunguney.com/userfiles/files/84249800493.pdf
    • http://wellnesszeewolde.nl/site/data/ws/files/rilunitedazifekufi.pdf
    • http://master-vin.ru/files/file/pobop.pdf
    • https://enerjimakine.com/tsrm1/img/userfiles/file/wepetoderikobofivowij.pdf
    • http://kehlux.lu/userfiles/files/97286228594.pdf
    • http://metabolit-plus.ru/files/file/nepevumo.pdf
    • http://ntep2008.com/UserFiles/File/9832815647.pdf
    • https://dveropolis.ru/upload_picture/85647929168.pdf
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/gejewelinek.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_off0000d61c.bin
dea9ba768faa80fc17239a22fc49668463c5fbf82d90df5f007292686f089f16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD61C 10664 bytes
font_01_sfnt_off0000ee83.bin
f42e21472398a395dbb30db8dd5f4a6124fbdf9315e62f9b211d9d8466f4aef3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE83 17272 bytes
font_02_sfnt_off00011aaf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAF 16792 bytes

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