Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef070f3b092131fa…

MALICIOUS

PDF

80.1 KB Created: 2020-11-14 08:21:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 15dcac5b7a106ab3a56d0505868acc2b SHA-1: b47777afd1ff6da0af2eb1d9763e81762d328f1e SHA-256: ef070f3b092131fab24ebd7f9dfff888da20ec5bd3f741b08eb5bf6a8bff15b2
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to exploit the user into visiting a phishing or malware distribution URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=the+outcasts+of+poker+flat+questions+for+american+literature PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383800/normal_5f90b09ad35aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384320/normal_5f8c7f13a2a82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501961/normal_5fadbdd28fdc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369304/normal_5f8b2d6037bbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366340/normal_5fa36b6bb2fe9.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/b2089730-db9d-410e-9b32-3352a4c1e6d6/vubesikalivowabegux.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/21398325197.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b14253c-2c09-412c-856e-50c4b2b705b3/mupenawewutopazu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8be0a0e6-e27b-41d3-b43d-6c621c1f60ab/14699800774.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/alternative_dispute_resolution_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e801ae6-d93f-4663-a0dd-d86a41f86821/rick_graham_datcp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff2a8f1a-3fca-40da-aaf9-588a84132dd4/73708307648.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_off0000fd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD71 5392 bytes
SHA-256: 46bdbbc3ac9d4f4df9a6ca09c9b53a93a6d94fc173dcd7e9ec8b15b708814df1
font_01_sfnt_off00010fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA8 10496 bytes
SHA-256: 1c5cbea13a5f87a8adc97ca608978973b7ed7829a94ac37e3f31fc6d02d538c1