Malicious PDF — malware analysis report

Static analysis result for SHA-256 247ee0a5f4422daf…

MALICIOUS

PDF

80.7 KB Created: 2021-09-20 18:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 68cc720f7e11f300d2f726835a57e934 SHA-1: e4eaf91aee82f547b2503e7079c76d8b395d047b SHA-256: 247ee0a5f4422dafa31d84895343ed7ff55387f8912368b4d4f8f0a5ba985e04
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of embedded JavaScript and a large number of external URIs, many pointing to disposable domains, strongly suggests a phishing or malware distribution lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm designed for SEO manipulation or traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inwebjor.ru/uplcv?utm_term=swords+and+sandals+download+pc PDF link annotation
    • http://cgl.lu/userfiles/files/18158947698.pdfIn PDF document text
    • http://armanetti.com/images/12282746653.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/55743589960.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/bagigumumanibuxi.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/28005296924.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/nisegopivemebenajosek.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/refukiwarex.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/32858347387.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/49021339103.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/zeberusumufipirurolesizi.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/banulutivememuvefod.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/61106356752.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rijivetijoderor.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428ce362eb9---kopob.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210914164917.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/xanubiwiwi.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/9862289606.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/95330651483.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/51901067802.pdfIn PDF document text
    • http://dr-temt.ru/images/file/nemexemawamabaso.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/bigiraredabumi.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/detijatigexafarola.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/sufexixajupu.pdfIn PDF document text
    • 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_off0000d8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C2 17068 bytes
SHA-256: ec4f74c4bc7bf8d47f4428fd38f5ffe47aeb5af0a412808b7242ab1ee209752a
font_01_sfnt_off00010598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10598 10344 bytes
SHA-256: eb598d37005d325434d9e8a0fcc56c21fad86fa6e2f19e55325dcd2e7b305bd6
font_02_sfnt_off00011d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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