Malicious PDF — malware analysis report

Static analysis result for SHA-256 d783c04d6d57e060…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 02:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41f607bd58ec5b191a02b31d7f6f0968 SHA-1: a34a562a4a8a85eab4b78b3faf0e79a3d5435a87 SHA-256: d783c04d6d57e0603a28c5de915dbac6bf8fd589d578ae5646df37c39a6b6262
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and external links are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://medvor.ru/uplcv?utm_term=superhero+game+mod+apk+download
    • http://sushrutproctology.org/ckfinder/userfiles/files/51323720822.pdf
    • http://olgapolyakova.com/files/files/xamisexugepagise.pdf
    • https://karlschool.org/uploads/files/202109140229464625.pdf
    • http://consol.hu/images/uploadedimages/file/mapanupoz.pdf
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/87306332994.pdf
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/felesifanisulipurijiwo.pdf
    • https://samsunyapi.com/userfiles/files/40060786739.pdf
    • http://dlzj.net/upload/files/20210917135315400998.pdf
    • http://berbun.com/user_img/file/dunaredufaxisizisojofof.pdf
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/movatikuxapafivow.pdf
    • http://lnshiyue.com/userfiles/file/20210910152852_2075069378.pdf
    • http://spbi.cz/res/file/9260739842.pdf
    • https://lyubomiradineva.com/files/file/78301618981.pdf
    • http://debeight.net/UserFiles/File/gigadonudekiv.pdf
    • http://www.insight-assessment.com/ckfinder/userfiles/files/xexemulujifud.pdf
    • http://imhkayseri.com/resimler/files/59463790854.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613549c61863a---wivoneluzitexomafutovu.pdf
    • https://rent-1.es/ckfinder/userfiles/files/liduzasagetusi.pdf
    • http://thermcom.cz/userfiles/file/supupixerebarumirisobefo.pdf
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/3392926791.pdf
    • http://musthighschool.mn/ckfinder/userfiles/files/15899891651.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/1040e4fd929371108c8113d61e38942b/82323142452.pdf
    • http://halaljones.com/uploads/files/mokaxigipimaradi.pdf
    • http://eventechsite.com/files/files/81527136432.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_off0000d811.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD811 16792 bytes
font_01_sfnt_off0000f023.bin
b6ba55ac3d554c0d534f27c45fd42dd16f7598e00b0929ec3b899bf5ec6e52d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF023 17560 bytes
font_02_sfnt_off00011e3d.bin
fcfe29867c19e5b72e3fee3b5fea16bcf29313ccb7146b667b003ba71bb88119		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3D 10832 bytes

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