Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6ac29d16511769d…

MALICIOUS

PDF

70.5 KB Created: 2021-09-08 17:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dd8ea3e53a1e8b085a791075099bacd9 SHA-1: f8042027f6d0ed80ce734c2a90ab9de7b5ceda6d SHA-256: f6ac29d16511769d649c2e79e650ff4cbeb3f904efba056a10640a26bd8e6ffc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of using disposable hosting for a large number of links, often associated with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://renfrewareahealthvillage.ca/ckfinder/userfiles/files/pufisoziwis.pdf In PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/67009898144.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/13b1804519cfc230bc0bbd1bd03ae60f/bigowadadazize.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/23658051034.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/29643676995.pdfIn PDF document text
    • https://kokomanis.com/contents/files/41862814437.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/xowokuk.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/51351368155.pdfIn PDF document text
    • https://digireg.it/upload/64280146252.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/65594423038.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/nuvevagetojugokad.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/55251900786.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/88453979594.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/20219822710.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/nivon.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/tegon.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/v9767i3dfujbcq46stskn80413/wemej.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/46544580832.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/44671658495.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/sujidokuj.pdfIn PDF document text
    • http://dobski.pl/userfiles/file/41832374392.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/fawigulovo.pdfIn PDF document text
    • https://mcsfood.com/images/file/69013145797.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=best+ethical+hacking+books+2019+pdfPDF 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_off0000b181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB181 11544 bytes
SHA-256: ff93339b0273be8a6e2a54d7bac55794ac35f148a282c67fd946beab222962c0
font_01_sfnt_off0000cc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE492 15776 bytes
SHA-256: 62b19fa6b58fb41ff2f0f02455296b5f0903102985962cfbf60abbf37bebb6c2

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