Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b47461206b6fd13…

MALICIOUS

PDF

69.0 KB Created: 2021-10-03 20:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 70f3d68f5fee5df617831f523aaa6cfd SHA-1: b1156938ee25147a236dbbf082ba20ba6d0ef6c5 SHA-256: 1b47461206b6fd1314a7344ec0d807f27633e947b848b2053a123232ac402fba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs suggest an attempt to redirect users to potentially malicious sites for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=family+quotes+christmas+carol PDF link annotation
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16150b472b5d2b---tuwijomu.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/podejujopeduxiwozowuz.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/milolivejimujinar.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/zuxaze.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/guwekuzazovumunize.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/gugakor.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/70165696804.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/bozum.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/ladulekus.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nudobipogipifegeb.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/9041890165.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/maduregisivixobesisutale.pdfIn PDF document text
    • http://nwmanagement.ru/generic/uploaded/file/jatedori.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161496477aa5f5---nemit.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/50427918579.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/83517657839.pdfIn PDF document text
    • http://hzdsbg.cn/uploadfile/1630768586.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/wogudikose.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/pidofidofutosenoli.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/55621704084.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/wawizoxejep.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_off0000ad22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD22 16012 bytes
SHA-256: 8e774d006daca7020194ea63793ea5e650427f3ca0fcf80ff7fc72498fd5f460
font_01_sfnt_off0000d61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61B 10728 bytes
SHA-256: 752c4a3d4e572f24d08d5a8e12778ef11c8be5a82d180b1c4ed79a337a4d6198
font_02_sfnt_off0000eecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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