Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c95508af7206682…

MALICIOUS

PDF

63.2 KB Created: 2021-10-03 16:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9d0c6e61ff2319bc36ff0b881add7d46 SHA-1: 5cb00c1b488fa414b0bbb5c77a5721115dbf7f2b SHA-256: 3c95508af7206682617adbb1bb44b7266460bd44d158d4b3ddb73a8ea354d06c
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a technique to obscure malicious links by distributing them across many disposable domains. The presence of multiple external URLs suggests the document's primary purpose is to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5661

Heuristics 4

  • 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
  • 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://ketchas.ru/uplcv?utm_term=tom+wolfe+from+bauhaus+to+our+house+pdf PDF link annotation
    • https://lanjutpt1.com/contents/files/46269457108.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/40872403707.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/sivizagosifoluborelix.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/55962880819.pdfIn PDF document text
    • http://gr-chem.com/upload/files/fajumojuguj.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/64226209372.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/67521342966.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/92848723906.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/98055292108.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/3193904646.pdfIn PDF document text
    • http://erago.cidees.com/uploads/files/kelapegewugotume.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/bonidunupogozegenovuwatot.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/zexulozadapifoxusa.pdfIn PDF document text
    • http://hzosm.com/images/upload/File/91456892027.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/85442914882.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/65867854868.pdfIn PDF document text
    • https://ratosatu.com/contents/files/92444798592.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614826b754c92---72671060869.pdfIn PDF document text
    • http://terminsk.by/pics/files/46502184387.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/kunabuwegagogilezofi.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/6299082670.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/e71d41f789575e9c005103fb275777d2/34644252874.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/vivul.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109210553148561.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB02D 10856 bytes
SHA-256: 359fb21bd7b2629d9474ebbf2e87cc2f7ed90a62fdac46da0c22b40043ae8c28
font_01_sfnt_off0000c919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC919 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1