Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1709b71c6620d93…

MALICIOUS

PDF

81.3 KB Created: 2021-09-14 13:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9f2ba6cd0c376fac0f7c48cbec8c4f91 SHA-1: d7ac3e07f9939df7b0b272bc24bc794f246c18c5 SHA-256: e1709b71c6620d93f0bb0978bc99d13a7a24767b5e7b6f67c99c3eb15e80f132
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document uses a cloud document lure to trick users into clicking on malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://tele-video.ru/upload/files/55512412434.pdf In PDF document text
    • https://webhosting4.net/media/file/45652842148.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/56588074387.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16135664228fd0---63484985448.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/wawozusaferenonigiponuv.pdfIn PDF document text
    • http://hiniceshine.com/upload/2303795540.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/86544114749.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/nirexiwugokasavimatugizan.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/99701366314.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/jukobiforizuk.pdfIn PDF document text
    • http://gekon.net/userfiles/file/kegeputomekugojudukab.pdfIn PDF document text
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/47253757850.pdfIn PDF document text
    • http://garderoba.sk/images/_file/25296218538.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/16899911063.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/kufegej.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/tewegedemitagalato.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/98826223795.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/26799102754.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd205b6ec8---24135861817.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/vusedovebabedepit.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/kokex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=mp4+video+to+wavPDF 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_off0000dc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46B 10188 bytes
SHA-256: dc2c3ec2b858d1fecdd23385be53c09c4f7b036bd0e7ca40022f47608c70ea43
font_02_sfnt_off00010b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B71 17024 bytes
SHA-256: 1b3780a6bad6032a04c16b778d637b3b4592261cd660c0d5cc5ea4a0634d1ae4

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