Malicious PDF — malware analysis report

Static analysis result for SHA-256 6db339e88d2a7897…

MALICIOUS

PDF

72.2 KB Created: 2021-09-22 09:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b64811233c8aecdc5a7d22d54fec0283 SHA-1: efc9268d8372e461ca6eeeada9771397c60677fd SHA-256: 6db339e88d2a7897720e5ec1705a8896cc5a64c591abde275f7e96f46ae417f6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host numerous links on disposable domains, likely for phishing or malware distribution. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://smidgel.ru/uplcv?utm_term=osi+level+4 PDF link annotation
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/jofesoxifavijuxo.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/84019734586.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16138253158fa7---31641049711.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/52226631365.pdfIn PDF document text
    • https://heyratacademy.ir/file/jukabamejoletewuvefesevu.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/dofirelijo.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/24070848079.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/20498596498.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/80842783560.pdfIn PDF document text
    • http://labsshop.com/d/files/pebuzagujofinaz.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/rejuwisitame.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/88098866982.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/5088710778.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/60630565283.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210902115603.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/59317671772.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327787668d0---52517215009.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/74324974850.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/2864937451.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5f06cd8e5---noruxilutigiriterutaxe.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/18496060213.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-1/20210901071823406720.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_off0000bc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD485 16296 bytes
SHA-256: 6fd505de8de64874e12d89e9d9b8fd91874c577d49733ce29aa7d09055a6cebd
font_02_sfnt_off0000fe3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3F 9684 bytes
SHA-256: dbf82e56d1471789151410a461bc813677a862c2c9ad48f0002cf22ec5d09569

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