Malicious PDF — malware analysis report

Static analysis result for SHA-256 d741fa9e07e38a80…

MALICIOUS

PDF

76.7 KB Created: 2021-09-28 14:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 66ee29f94eb4f15297461ac6b6ac891e SHA-1: 6ad8db6d542fd883f19a09488cfc611da6e2e60b SHA-256: d741fa9e07e38a8006e80779b85bb61383dce352581844898915d2b5fcf7943f
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for distributing malware or conducting phishing. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of external URIs and link farm characteristics. No scripts were extracted, but the document's structure and embedded links suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 4

  • 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://coretry.ru/uplcv?utm_term=vortex+gloud+gaming PDF link annotation
    • http://altera.ukrstroyka.com/content/xuploadimages/file/jowof.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/2v8l71fqps7dl20drj5o407lv4/nufikojogabazifev.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/lonisogunubu.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/wibaxeges.pdfIn PDF document text
    • https://meridianchem.com/meridian/ckfinder_userfiles/files/2890191360.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/33939487638.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/wuwopale.pdfIn PDF document text
    • http://tourgrodno.by/images/content/file/jowipijibe.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210913090707.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/gubipugerevazu.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/89200330234.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/sokekevo.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/66376111966.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/73253254211.pdfIn PDF document text
    • http://pay2pay.net/upload/file/xiwovum.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/51267007088.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/newunukakafasolux.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/bkqm5aok7qieceruik2gl66g9s/wipop.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/55828449411.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/60213793208.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/tagaxudofimazoveruvimi.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/91356701719.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/64385342612.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_off0000c104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC104 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91B 10596 bytes
SHA-256: 3c9c4dcfef83b6e9f53aa0bb064c4e58d9232c58e46a0d0be4b53e29d38e5e77
font_02_sfnt_off0000f112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF112 20340 bytes
SHA-256: 7bbf0c76077aa5dc374ecf8d0b86a430a2e11e498c953944796155df2bafa277