Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d02397e66ff911…

MALICIOUS

PDF

108.4 KB Created: 2021-09-15 13:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 516eae894188fcbc5d4d3885eccd6b09 SHA-1: 521c4b41c4554da4296c5c49905b1249fe3c4448 SHA-256: 53d02397e66ff9112cda3b26e08c9b4bdfb4af42e65c6b54274cecec6fd004c9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, suggesting an attempt to distribute malicious files or redirect users to phishing sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deceptive SEO tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://x04ydivan.ru/userfiles/file/98590867537.pdf In PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161339740347fe---zobedax.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/63894755351.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109021335214737.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/2275868372.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3fcd4aa71---zamutozeneju.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/93805343070.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/gijafevakubu.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210902_123600.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021090913590273499.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/79111580096.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/13195825785.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/69766538613.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/jitoxo.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/lifuridumuwowe.pdfIn PDF document text
    • http://rc-modeller.se/images/file///10503356960.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/67843530223.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/zidipisinigosejifitenot.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/28721278590.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/22723835556.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/24545808760.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/50802952002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=xperia+x1+rom+downloadPDF 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_off00013dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DCA 10536 bytes
SHA-256: f118d45fd1289654483e3f1540a456510dcae0bc7b0d8d4855c4fb0a8e6c807c
font_01_sfnt_off000155be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155BE 20552 bytes
SHA-256: b991d906eeed6c8bd5ccf25a58375e4b4a136b7af231476f5b125bd163556118
font_02_sfnt_off00018c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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