Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce14b361443fddaa…

MALICIOUS

PDF

89.0 KB Created: 2021-09-12 03:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: ceb6e6984009bf4e53f85850aa1f5794 SHA-1: f35f0863732bdfed438112c5ce9580be1cf03a60 SHA-256: ce14b361443fddaa687e052f650f704504c64440052881871311842e1baa8ec1
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://stnicholasway.com/userfiles/file/wegekubi.pdf In PDF document text
    • https://namphuctourist.com/userfiles/file/22119598023.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396df80d463---81982850342.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/fesusonagupa.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/zozukakajejewenewevo.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/8946717735.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/13922321958.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/nenugakaxisi.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/8133732659.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/62572793443.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/boledepujid.pdfIn PDF document text
    • http://hkwwta.org/userfiles/44750467606.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ed98ac521---xigubaretetin.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/57442918627.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/kopoxisawarafu.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/35332086505.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/52597709561.pdfIn PDF document text
    • http://haai.org/upload/file/84503993131.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/82558012621.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/613a816cbbe1a.pdfIn PDF document text
    • http://yogasol.cz/ckfinder/userfiles/files/21694118022.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/32586736892.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/19151759265.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/28719049176.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=4+player+flash+gamesPDF 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_off0000fa67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA67 10488 bytes
SHA-256: 55001bdabf6e2bb25616af934ce927f16b60b2cf009e6d9fd804dca35e08007b
font_01_sfnt_off00011252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11252 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A64 17080 bytes
SHA-256: c1a68f5082e8dbc6c77a3eb22891dd2217f1b1ee2707304670d081f1c3adf857

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