Malicious PDF — malware analysis report

Static analysis result for SHA-256 48ca16456dc015ff…

MALICIOUS

PDF

87.6 KB Created: 2021-09-10 17:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 75a6c043ff5426c30d194ca92964e38c SHA-1: 55095419206479b08a2f35cb3bd779624008f750 SHA-256: 48ca16456dc015ff781d79cb96eadd848e4ec823cff30c98c20f0e4c6b44d81a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm, with numerous embedded URLs pointing to other PDF files, suggesting a distribution or SEO manipulation scheme. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://videofilm-tv.ru/content/File/47601698255.pdf In PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/6852071774.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/xalediluzotixofax.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/74905231765.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613075ed32d0b---dufelozimumuw.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rubipamive.pdfIn PDF document text
    • http://lovesenergy.nl/file/delaguxoximamavu.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/23973402446.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/bubivexoninivojuje.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/pajovijukuzimukutiboleb.pdfIn PDF document text
    • https://akemi.ro/hirek/file/71166547705.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/rizutelawajagemil.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/lifenuwewoxovewejemapozum.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/gogotuburinupalerijanesa.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/83878861428.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/96042171638.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/42952421928.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/7053339450.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/wevekonidotoz.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/63772546460.pdfIn PDF document text
    • https://austarpharma.com/upload/files/59558746817.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/garesoboraxetefidij.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/89737983052.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=baaghi+3+movie+online+playPDF 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_off0000f19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AC 17948 bytes
SHA-256: 1a1f6b62b23ebced54d1d2396d849bed8954c4464bb24761b1751ba1ae857e51
font_02_sfnt_off000137e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E4 10740 bytes
SHA-256: 5609f094cadf6befd7ce69e5fb0595ca197e1fff444935a87a2b480af9394443

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