Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f61d2fd17d29d83…

MALICIOUS

PDF

86.3 KB Created: 2021-10-09 00:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 139853c9125d217cf041d0afa6b50c23 SHA-1: e52d9f19a63f97f392c9ac439b8767797916511c SHA-256: 6f61d2fd17d29d8388ad687b7e5e14e26b72a873074b8322585f8f6a51132bbc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://huntic.ru/uplcv?utm_term=giardia+clinical+signs PDF link annotation
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/biwujigebatuwenodabig.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/voxibo.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/67397916941.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/68660298574.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/14377928512.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/vawil.pdfIn PDF document text
    • https://adikmanis.com/contents/files/wodoxotonox.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/22109456794.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/dubakuk.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/49934902533.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff5e98b206---zewafuzebisumifoz.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/rivozibuvanevebepujomu.pdfIn PDF document text
    • https://zarrue.com/app/media/images_description/files/47893544175.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/28262672486.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/7932409256.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/zibeseworijewutujema.pdfIn PDF document text
    • http://safetruck.gr/images/file/padomelen.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/22244679259.pdfIn PDF document text
    • https://uhcp.com/editor_upload/file/pazovalomazezovediposulor.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/fesokekosuwituwasegamo.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613514d9ca461---rigurubepapi.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/lirasa.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210917190102.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_off0000eb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB37 19232 bytes
SHA-256: 062063d582026d117563bb9919f427b0a5d97c5be604a0c989a0a4925178b59b
font_01_sfnt_off00011d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D02 10236 bytes
SHA-256: c5fc0d77bcb66fefe86d42eccfbb5c56fee637729245362e6e7b5448d3fdb422
font_02_sfnt_off000133cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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