Malicious PDF — malware analysis report

Static analysis result for SHA-256 73f24ce55c4d2a08…

MALICIOUS

PDF

98.9 KB Created: 2021-09-21 01:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: beaaa2252505a2d985ce68bad90dfd71 SHA-1: c39582dfbadac8744f14254fe7d9cd6115aeb3c7 SHA-256: 73f24ce55c4d2a08e83ddbf49d49754d3c6cfe529bbd2d8a667b3a5821e80085
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external domains, many of which are structured as link farms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://krisoc.ru/uplcv?utm_term=samsung+touchwiz+home+lollipop+download PDF link annotation
    • http://jsdarvin.com/files/nodudov.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/28b6ab6c18d4e1cbc91e34b3d2eb91ef/mopazeripiruwabewot.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/92709463983.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/25749625401.pdfIn PDF document text
    • https://claudiodituri.it/uploads/2550449653.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/logeleduvovo.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/97645976614.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/72445838444.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/zakekimozide.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133c177079d9---70775910227.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/fuletifinolojefo.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/pefij.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/5778179553.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/46144601872.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/saxifofipirazafuvotalomur.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/57665847321.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/53066499688.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/16111519807.pdfIn PDF document text
    • http://normel.org/files/upload/file/luwejugisipipasadoradaz.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/47949171574.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/23712306134.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_off00010e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8C 23720 bytes
SHA-256: bb84b6eaef3b907ee6fb584663c0d84b9442e904af173b937085cf090de29473
font_01_sfnt_off00014c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16466 11184 bytes
SHA-256: 1c6e7fa45bcd200fae7e87aab15b0802e665e4896ffab0fa82ce1f3193c62aef

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