Malicious PDF — malware analysis report

Static analysis result for SHA-256 552c0e3589f6bd9e…

MALICIOUS

PDF

83.4 KB Created: 2021-09-10 18:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6774e9200c5228883541aca6afdecf61 SHA-1: 9e94628a8d565ffbfbe2b281ed05e5394bb28767 SHA-256: 552c0e3589f6bd9e5d44baa4c44bc6076dba66551aef849023054face5ad59aa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to PDF files on external domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure strongly suggests an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

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://daulte.com/ckfinder/userfiles/files/87896866471.pdf
    • http://wawa757.com/uploads/files/76389810019.pdf
    • https://congtydaihai.com/upload/files/55073943328.pdf
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/24537566485.pdf
    • http://sz-nuoyi.com/Upload/file/2021090916113927846.pdf
    • https://badrivishal.com/media/52630901746.pdf
    • http://tcyy88.com/userfiles/file/2021091023004773499.pdf
    • https://ebal.ro/app/webroot/files/userfiles/files/tinisodasuxegixu.pdf
    • http://morecoredesign.com/images/imageUps/files/vozadi.pdf
    • https://monographie.com/ckfinder/userfiles/files/86726544096.pdf
    • http://tulga.ru/editor/files/49028917107.pdf
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/betedafura.pdf
    • http://kovofilm.cz/userfiles/file/kenixasixikuf.pdf
    • https://kratky.eu/files/file/24252122487.pdf
    • http://bajcsidavidfoto.com/_user/file/8155627592.pdf
    • http://satunatc.ac.th/ckfinder/userfiles/files/tuwerupedonekubijokojuj.pdf
    • https://suavitinhtannha.net/upload/files/22372873921.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161399c843af68---28845853180.pdf
    • https://12shio1.com/contents/files/39199004528.pdf
    • http://fskyok.com/uploadfile/files/xozenetusovinorijesuzobu.pdf
    • http://lagerunda.it/public/upload/file/lavegejasenebilepalufu.pdf
    • http://uelzecht.lu/userfiles/files/74754321791.pdf
    • http://cl-metalparts.com/d/files/12057379253.pdf
    • http://karthikeyanjayaram.in/userfiles/file/wopepa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=queen+margot+movie+watch+online+free
    • 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_off0000ddf3.bin
cf4a35c4554ca7fccfd5127f42346c2b660f4dd5217ff1d8ec26bf19fcb2e987		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF3 18724 bytes
font_01_sfnt_off00010e6c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6C 16792 bytes
font_02_sfnt_off00012683.bin
9ed383fb4c2f1a427c9c4ec8b451e250633efd9839d01386667c45d3ff5a57c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12683 10924 bytes

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