Malicious PDF — malware analysis report

Static analysis result for SHA-256 e66a43afd5768b97…

MALICIOUS

PDF

71.2 KB Created: 2021-10-02 11:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 16b792e0751494ea5afe78de665c3607 SHA-1: bc826e0e19520c614787f55c4bb1c847af7d24b1 SHA-256: e66a43afd5768b97d7e33f6123fd487e62edea3ec2f44e8f1a7fb41624ce002b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, with a high ML classifier score and ClamAV detection indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's part of a link farm designed to host numerous other PDFs, likely for phishing or distributing further malicious content. The embedded JavaScript is likely used to redirect the user to these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/38172739987.pdf In PDF document text
    • https://sintasyapi.com/img/userfiles/file/34301099527.pdfIn PDF document text
    • http://sartor.ru/upload/files/1704770007.pdfIn PDF document text
    • http://telangana99.com/userfiles/file/javowabo.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/52001109515.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/kagaj.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/simibebepulabadimowuxa.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/tirezelewazosofijun.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/fedevowivepojogavatowimu.pdfIn PDF document text
    • https://suncables.co/images/file/83217397137.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb748cecfd---tezezugiriwoxipukena.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/25459146059.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/kisasapizixorimojididaw.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/79577262201.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/93118375784.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/36634042179.pdfIn PDF document text
    • http://clerus.hu/files/file/35112972763.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/pukenevamemiwozutewewalox.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/gamafumevetobojuta.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/xakawatovekizu.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109230523233924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=geo+resistivity+survey+for+groundwater+explorationPDF 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_off0000af7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF7D 17496 bytes
SHA-256: 40535cd5a0cffc084e1a0b4cde8f75e0c7e03ce5fad8fbbf0c7f6da1978e9f19
font_01_sfnt_off0000db55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36C 11180 bytes
SHA-256: 0c9e6e08107d866086d8a326872ddff58926fc21b992bd6d8b54d31fd2a371de

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