Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3b535cb84a3b90f…

MALICIOUS

PDF

78.4 KB Created: 2021-09-11 09:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d1338601fae8f313f2e7ac96560a45a4 SHA-1: 613c5721cffd810c911173d46b7f07ae55407dcf SHA-256: e3b535cb84a3b90fb9b6b144b056ef66c39c4c8ce4e8a424d820bcab462a7a88
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of 'utm_term=free+codes+to+get+robux' in one URL hints at a potential lure for users seeking in-game currency, a common phishing tactic.

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://absolutelyneon.com/userfiles/file/5122808343.pdf In PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/guwoliru.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/63935180019.pdfIn PDF document text
    • http://marketingnews.fr/images/file/49588739448.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/bedapefifujexesow.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/43605684155.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c28d985bc9---43545058791.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/96087753649.pdfIn PDF document text
    • https://olterus.net/contents/files/42701570333.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/63546906190.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/xudiw.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/jaxuvubane.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/duborafofogarida.pdfIn PDF document text
    • https://jss-moms.si/upload/File/79539284015.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/52498175672.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210910115622.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/limarazafujaz.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/tejibak.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/pifofilive.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/kewivirinewatozabanofatex.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/506b4a1aa51855445aac8206207ca0ce/peburebuguruze.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///mimitimeriveriruruxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=free+codes+to+get+robuxPDF 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_off0000d02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE841 17184 bytes
SHA-256: be583613c19760e819650f975b014d6fe58331419906dc83f5779ac5f1d44931
font_02_sfnt_off000114ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EF 10460 bytes
SHA-256: 259a273d3a25b4e725cd385d90a11dfd81fc841b4e6e619cdfa4d1090e33fe63

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