Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6bd6a199a85b538…

MALICIOUS

PDF

75.5 KB Created: 2020-12-26 10:23:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f9fb6f82795660558ec7f609bcd59999 SHA-1: 408e400a0e6feee404f2a5fd890d461b94f4f0d8 SHA-256: c6bd6a199a85b538917d5041085fb351332ae8991a565b2ee1efc021bf9f634e
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains an embedded URL pointing to a suspicious domain. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. The presence of an external URI heuristic further supports the malicious intent of directing users to a potentially harmful website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://trafficel.ru/123?utm_term=guitar+inlay+stickers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450141/normal_5fd091f885e37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484370/normal_5fc24588e759b.pdfIn PDF document text
    • https://mebavowu.weebly.com/uploads/1/3/4/3/134353315/4e9126bee20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459054/normal_5fdb2688ab55f.pdfIn PDF document text
    • https://puzomukasudugun.weebly.com/uploads/1/3/4/8/134865935/jogaz-buvesiguk-jirezu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/banula/regulation_review_endocrine_system_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/excel_2010_sheet_not_scrolling_down.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b465b106-3ee9-4c6f-ad77-27d19d7f1485/marvel_strike_force_cheats_ios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5177177-5126-4e7f-b7e3-6fd312875d5e/the_studying_hours.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e68e209-4f01-4430-ae53-f44cf4008bbd/67365013451.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4B 4760 bytes
SHA-256: 93387f9f2147a4ea0581ba2e94a00d6c8c4d5f9c6eb88847eb128ee09a2549b6
font_01_sfnt_off0000ee8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8D 10600 bytes
SHA-256: 6654ddec061dde520b4c3c3c2caf97baa4f00bd2a5d0348a5e4fe48e3d560a02
font_02_sfnt_off000112f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F3 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f