Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aff884f21964059…

MALICIOUS

PDF

71.8 KB Created: 2021-09-17 00:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c012c0f47c4a980a26afa5e2cb5a5bd1 SHA-1: f9e69e65643883ba4249d86b730489129e4d16e0 SHA-256: 9aff884f219640599c3d3de42e5998dda2e1fb3c76c6f67257be479a9e2431ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external URLs, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of embedded URLs and the ML classifier's high confidence further support its malicious nature, likely serving as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+%D1%81%D0%BB%D0%BE%D0%B2%D0%B0%D1%80%D1%8C+%D0%B4%D0%BB%D1%8F+%D0%B0%D0%BD%D0%B4%D1%80%D0%BE%D0%B8%D0%B4 PDF link annotation
    • http://onestep-tokyo.com/userfiles/file/rulotubote.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/penoligumipegomute.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/votodozumefopanoret.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/67057019350.pdfIn PDF document text
    • http://15881588.com/ckupload/files/85693594658.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/19652650722.pdfIn PDF document text
    • http://feminella.ro/upload/fck/jolobolitusut.pdfIn PDF document text
    • http://identik.hu/editor_up/galovipapikinirevike.pdfIn PDF document text
    • http://skia22.ru/pic/file/vakiwubadag.pdfIn PDF document text
    • http://cocoabuterol.com/upload/files/39169481447.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/dikidolero.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/75341648150.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/luzemuwavabusevupobobodo.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/99753386583.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/rojari.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/44953937786.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/63470152031.pdfIn PDF document text
    • https://aitalk.vn/upload/files/84193259183.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/delifetofazo.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/wobudezos.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/55381105951.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3373d0176---ximemosikavojef.pdfIn PDF document text
    • http://chemsdano.com/upload/files/dorojafagiledag.pdfIn PDF document text
    • 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_off0000b044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB044 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC856 19096 bytes
SHA-256: 4b725ff3ba1cbcb92115ebc952fd3396775c89dae444958c430ce0e4eccdeac8
font_02_sfnt_off0000f713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF713 10668 bytes
SHA-256: 0a6a09864568e46b87866c84cef02deea1c999581d815bdf89c95d7373368ae5

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