Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af9d9fe3d8a40f5…

MALICIOUS

PDF

88.8 KB Created: 2021-09-19 10:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 58625bf28995491645bff5f6abb56279 SHA-1: 66f84e868369ed16b3dcabd0962d07c971d68265 SHA-256: 4af9d9fe3d8a40f5f31b4ab0cbc49e0f400b067b8158c80cd8ccc33bfdd58f67
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely related to luring users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://irlanc.ru/uplcv?utm_term=the+kissing+booth+full+movie+watch PDF link annotation
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae41f132b2---xudazat.pdfIn PDF document text
    • https://temahr.hr/files/44374051909.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/64272297949.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/67003484882.pdfIn PDF document text
    • http://mobiliteit.nu/files/gasufimujiwiwudi.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/03fb907b61c55f70b9ced2551722efa7/favobejugorubomejenavige.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/janisilete.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/nixese.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/momojutitebipit.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/mawaxomotixe.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/zofuxewitifowar.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/wadotefulunaf.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/gawigowifaduniguboges.pdfIn PDF document text
    • http://plise.org/userfiles/file/lenumenejoguliw.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/96739374631.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/64294113411.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210915173039.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/58807699338.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/felipejemunutipotow.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/52310037770.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/niwujepixomaxikuloga.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/4220883816.pdfIn PDF document text
    • https://temporar.mirceaseminee.ro/printuri-fi/files/11323716599.pdfIn PDF document text
    • http://baove247.org/upload/files/55612810659.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_off0000f693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF693 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA5 17596 bytes
SHA-256: 478f809410bd1968b360da6c5e37599d51f4fcbdd4bb3d9a02830221fdcd6595
font_02_sfnt_off00013bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BEF 11128 bytes
SHA-256: 1a6b4eb347934d80eb3945af453feaaacd772fac06aa5c0c82d688f6a9a08912