Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b8e0d9d8c0ad562…

MALICIOUS

PDF

80.7 KB Created: 2021-09-18 10:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2cf042713c612df029abd49509d18c5e SHA-1: d56664b1485bf0972e8d49016c9e0e3fb314be8a SHA-256: 3b8e0d9d8c0ad56235a60fb8ec4a5aed920e11e0968900de2d30d959f7c1f515
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to potentially disposable domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to lead users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://maintogelonline2.org/contents/files/19304230835.pdf In PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/41373909722.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/zunetifeji.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614154c28f5c0---10281831579.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/75313605984.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/punelebalopesilebakukowe.pdfIn PDF document text
    • http://kechengchem.com/upload/files/muxuwiv.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210909_40E174DA6724761C.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/xiwebinemup.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/10445578002.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/zipatevevapo.pdfIn PDF document text
    • http://thaide.org/userfiles/file/rodabakaxudopabipesadu.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/mogexoxoxuxudibijasasuril.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/gunof.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e7275749a---5281753763.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/79629546308.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/gegubarabajamutalitib.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/febatinidafimerag.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/21293256335.pdfIn PDF document text
    • http://garderoba.sk/images/_file/82409922454.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/7684981784.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8f9c6e767---fetegija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=phone+format+appPDF 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_off0000d7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00C 10316 bytes
SHA-256: cde19c0dfa7ccf6e03748b1269ed5ad25559a2be4fc7922cef5f355e34f6a90c
font_02_sfnt_off00010718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10718 18000 bytes
SHA-256: 54997e444eb16d9248f40e8b601600e33d7ab60f92f549e1454b37717e2214eb

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