Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90cec2c3f691753…

MALICIOUS

PDF

61.4 KB Created: 2020-12-22 15:21:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a3d957fdcff368c2e588604a29bfa7f2 SHA-1: 2120a7d4c7035021fdfeabb32a7eb34c25b4520d SHA-256: f90cec2c3f69175366107475d57a22747b8cb4c21b011b0cdba992cba1667362
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a lure related to a book offer, directing the user to a suspicious URL. ML classification and ClamAV detection strongly indicate malicious intent, likely for phishing or to download further payloads. No scripts were extracted, but the embedded URI is a primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://traffset.ru/strik?utm_term=first+words+book+amazon PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405437/normal_5f9688e839ef9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383703/normal_5f979b1aec8c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367674/normal_5f89683948a6b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476783/normal_5fe0ed82566d4.pdfIn PDF document text
    • https://peziwotikiju.weebly.com/uploads/1/3/4/6/134602895/00a9f3b8b9ec4a.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/6baf1bcb-8c36-4e78-922d-55129d86833a/66135916110.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/windows_10_pc_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/4387327323.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/76258706173.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/007c75a9-d2ab-45be-81f4-b0ce011e49d9/90364275337.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B7 5240 bytes
SHA-256: 9a6a44caf4276f223426433c1ce36d77f0ffc5247ff0aaa0101ef7fc4f9768c2
font_01_sfnt_off0000c58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58E 10068 bytes
SHA-256: 10a9650907759a950fe64329e5f6aba621b2c45570c57c2bff269369d51f0176

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