Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c6705a98bb9951d…

MALICIOUS

PDF

83.8 KB Created: 2021-09-13 05:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9f07c07a7f9b96250d27db73ecfba76d SHA-1: 315d3df98677740fea6d6df4cda2811902c0b28d SHA-256: 9c6705a98bb9951ddb40d25df66f22c918b86634ac7e55824adf4baba7a86f51
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to potentially malicious domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure the true destination by using many distinct, disposable hosts. While no scripts were explicitly extracted, the nature of the links suggests a phishing or malware distribution attempt.

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 https://autoprofi.ua/userfiles/file/ludawesijununozoruf.pdf In PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/87805190030.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/winidewawoxojipa.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/xejibisof.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/31958581518.pdfIn PDF document text
    • https://shidoremicrosys.com/media/52536349670.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/62843958493.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/muvulu.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/96791701565.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/54346846405.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///49438452763.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/40363873493.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109020302082906.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/12944779884.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/29342843452.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/53833757810.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613da458e8ae6---veruzefokasexekozidi.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/59803278324.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/vasowu.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/42964712760.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/todosizezug.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/83290596243.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/90308999552.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/sibotajato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=kinemaster+software+for+pc+windows+7+free+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D5 10908 bytes
SHA-256: 519145d13272045c8f252dfc54dfb7840211321890a61ac3a0ce32eefd5eb6fc
font_01_sfnt_off0000fc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC28 17428 bytes
SHA-256: 01d483c1d493d7061ada998ec4a4c8a7971bd84d6102db2e7deaf322f7ea9113
font_02_sfnt_off00012935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12935 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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