Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5dc70f757ce8cd…

MALICIOUS

PDF

80.7 KB Created: 2021-09-17 21:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7177eb78bb033c0ac5138e56d5bca3b1 SHA-1: f5564375fc9723a4abfe4491048962a010302b26 SHA-256: bd5dc70f757ce8cd1cf56570263384c744840f11a749a2b0d3b20b42825dcee9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://xn--b1akwe.xn--p1ai/userfiles/file/85807645016.pdf In PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/87lk8inob1a1irascdijncnamn/96238653453.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/somejuxem.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210914181352.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/26263670577.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/25607578682.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/4025528043.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/kibebajagofilaz.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/kumewodosirizowopoxikupo.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/loxonosep.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46192318649.pdfIn PDF document text
    • http://dlzj.net/upload/files/202109080315393722.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36118365153.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/sewenesarimadosumukekuk.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/volakudazapuperozaxok.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/vizerogizifo.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1613439cc5f47d---67552688969.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/jogonuwurupakerejokol.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210910040214.pdfIn PDF document text
    • http://precisao.net/files/files/netenija.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/niwizip.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/mojefimetoboda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=vivo+browser+latest+version+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_off0000d890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD890 17152 bytes
SHA-256: 6c08241f8489ba561ff5682e9ebcaad3f50659eb6e912426a763c74c6e759d2d
font_01_sfnt_off00010562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10562 10504 bytes
SHA-256: 65164c37723a0470a8af3277737a68e44d48452f4e42c93cea0fcc6d5cf7ba1d
font_02_sfnt_off00011d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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