Malicious PDF — malware analysis report

Static analysis result for SHA-256 540b17b3eff8b58a…

MALICIOUS

PDF

69.4 KB Created: 2020-11-24 03:49:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6a9925fd629fce9618a6ac73a924af5 SHA-1: 53c739a26694e0776a3f961acc94a4cc469cd4b4 SHA-256: 540b17b3eff8b58a6c7d111db436e38c85c0ed0d0fc13249c57df4e447259a94
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains references to 'War of the flea pdf' and is associated with the URL 'https://traffking.ru/strik?utm_term=war+of+the+flea+pdf', suggesting a phishing or malware distribution lure. The presence of embedded URLs and the overall structure point towards a spearphishing attachment attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/strik?utm_term=war+of+the+flea+pdf
    • https://cdn-cms.f-static.net/uploads/4373985/normal_5fb2cf27ac89e.pdf
    • https://cdn-cms.f-static.net/uploads/4365634/normal_5f87401131dec.pdf
    • https://cdn-cms.f-static.net/uploads/4385417/normal_5fafb93365e25.pdf
    • https://cdn-cms.f-static.net/uploads/4384461/normal_5fa1eba9b3782.pdf
    • https://cdn-cms.f-static.net/uploads/4366984/normal_5f87647b1ebdc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/piwupevivotixi/blades_of_time_pc.pdf
    • https://uploads.strikinglycdn.com/files/e34def66-6136-44a2-963d-552a9670070b/21st_century_skills_rethinking_how_s.pdf
    • https://uploads.strikinglycdn.com/files/45a47858-bc15-4f94-8119-eae8a5ae2c7a/kezaje.pdf
    • https://uploads.strikinglycdn.com/files/34c6bb68-d11f-4d43-a960-fe4ff1071955/fozexivobixamoduzadof.pdf
    • https://uploads.strikinglycdn.com/files/565536c4-362a-4a28-b158-b29252da58b0/is_bruce_springsteen_touring_in_2020.pdf
    • https://s3.amazonaws.com/wujixus/zulukivoniketubonozimad.pdf
    • https://s3.amazonaws.com/subud/english_textbook_for_class_8.pdf
    • https://uploads.strikinglycdn.com/files/e0a340cb-012f-4c05-b864-0ac46c024d00/80143267748.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4fe.bin
b7f1a7af47b147721749805eb46a486b4f7ece082b9a1b2381fe0b4ae982aad3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FE 4964 bytes
font_01_sfnt_off0000e5ee.bin
6e7b00917262746c196e118e37b665d9d86537f2a60ebe2560766b29c36fe215		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EE 10280 bytes

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