Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8c18d286a08c62…

MALICIOUS

PDF

84.9 KB Created: 2021-05-19 22:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4b1dae5862e4571c6612d3802265a770 SHA-1: 15018d18e7d77fbc90f540d99f8b3e748aa13ffa SHA-256: 4f8c18d286a08c62cd8dfdbcce93e641e66de67aa4635594f5cf8bc61997f590
144 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a malicious ML classifier score and ClamAV detection, indicating it is a phishing or trojan document. It also features a visual download button and password instructions for an archive, common tactics to trick users into downloading malware. The embedded URL points to a suspicious domain, likely serving the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://resalured.ru/strik?utm_term=gta+5+psp+roms+mods PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475389/normal_605f3771851bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368745/normal_6028970a64d21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453333/normal_5fcd9dc12ae74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421477/normal_5fef34df1235c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375356/normal_5fd634b44289b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374848/normal_602a79891abb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385216/normal_60396c453484d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454281/normal_604d79149a012.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387920/normal_5fd6188d563d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387821/normal_6042f523dc389.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367644/normal_603925024d086.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407100/normal_5ff8511c449ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491673/normal_600274bc21dc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489988/normal_5fd916c672135.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466166/normal_605aaf71e0836.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369653/normal_603af8e310410.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457560/normal_606a81489e9f3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/329b3be1-162c-4ead-ae22-d41ab901d137/wixaxetok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8ebdaca-5f4b-4366-8adc-e0fdc1e66ea8/nesukavidajelavufinofomu.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://scripts.sil.org/OFLIn 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_off0000f4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BC 5228 bytes
SHA-256: c83dcf48787a583040cb5e3a190710d93c9de7668157dadee5b3f30a83e6dca0
font_01_sfnt_off0001066e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066E 11080 bytes
SHA-256: 34ae5778722b4a046748566c0f5a40555baa9be6c0e7c1ed899be00c3ea068d2
font_02_sfnt_off00012c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9E 17112 bytes
SHA-256: 436829979245b7126098886beec731c3e32f79caaa22165f5cf5bd484c81a714

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