Malicious PDF — malware analysis report

Static analysis result for SHA-256 418e4040d7360651…

MALICIOUS

PDF

81.5 KB Created: 2021-09-14 03:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2dbd394dff1bc6db31d9ca92fc9c6de4 SHA-1: 48ae8d20c5b03e26438870471f8d16f5da40705d SHA-256: 418e4040d73606514b7ed8ebddca6f56e8b4746908e7cc4eda6cb3a56110aa48
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple external URIs, including one identified as a link farm, suggests an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://g-shocktou.com/user_file/file/79349187847.pdf In PDF document text
    • http://www.serenissimaservizi.com/files/fepewawugajixinizene.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/82744551935.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/46331153158.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/pirijazimixide.pdfIn PDF document text
    • http://15881588.com/ckupload/files/gajakotasadijijorulef.pdfIn PDF document text
    • http://etre-belle.su/images/file/38676176947.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139d14e2ea2c---feveriwefe.pdfIn PDF document text
    • http://orel-trinity.ru/sites/default/files/file/24557200075.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/tawejaweloguvadezur.pdfIn PDF document text
    • https://asiapharma.la/files/files/16971827966.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/wojavapekelotugem.pdfIn PDF document text
    • http://shesob.com/file/files/14346107318.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/kefetowefesefapadukexolij.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/mikevoretexemifutasek.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/17342538447.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/30490211565.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/pakojurex.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/21986444264.pdfIn PDF document text
    • http://xtra360.net/campannas/file/butuluwijukozikuvudiba.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139ad0d5f4b0---15989421031.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/guwajo.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/27565229970.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=encouraging+words+that+start+with+the+letter+iPDF 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_off0000d8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B3 18100 bytes
SHA-256: ce230a984c1a9deadf4703ffc7e6f4365f83cd472dae2ce5a3a6b5fc5a3c3fed
font_02_sfnt_off00011f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F32 10820 bytes
SHA-256: 72b0b322a6d21d77c020cf9055883ff8723aaf6cf465f0afaa724799cabc3f08

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