Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4851dd28c065a6c…

MALICIOUS

PDF

69.2 KB Created: 2020-11-29 22:39:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 86cf8f9f3c4a0303d2b9e2f22915b8fa SHA-1: 00a816ae95d2ed90216547722e0fff1b0dd837c4 SHA-256: f4851dd28c065a6cbd932f2bfb7a0b4fc16aa636c07ce82dd01fca3e8e636e52
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains an embedded URL that directs users to a suspicious domain, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of an external URI points towards a social engineering attempt.

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://trafficel.ru/strik?utm_term=herejia+in+english PDF link annotation
    • https://gugabezari.weebly.com/uploads/1/3/4/5/134577353/nizomaxufafo-ridevak-sagaxowuxivubi.pdfIn PDF document text
    • https://sixapinipuso.weebly.com/uploads/1/3/1/3/131384402/golesizaloxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483082/normal_5fbf0e4e33e60.pdfIn PDF document text
    • https://jezasowafinam.weebly.com/uploads/1/3/4/5/134530254/kexubix-nokagaje-lewiteroxibivu-sawapawuji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365600/normal_5f9b8283d89ab.pdfIn PDF document text
    • https://nakidero.weebly.com/uploads/1/3/4/5/134524904/repudapugij.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/77b0bb67-becf-4ca0-9b51-45141d667a0d/lonakijekowod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8665985d-fbba-4a0c-ae86-7a3d349d8b0c/tv_schematic_diagram_download.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/tegogifetom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cf1fcc4-c671-46d8-8571-b9bd234cd39b/yamaha_dgx_230_keyboard_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f755e06f-0b7e-4847-a36d-afeb6e5b0e5f/rerisetabowan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcad1760-0f82-44f7-9106-4f240edcb724/thermochemical_equation_pic.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/grammar_exercises_for_grade_6.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_off0000d135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD135 4984 bytes
SHA-256: cf97bf7bfde4e9b8fd87207330e8dd4522a6b1cf9d9f70e64923ca1ced9ce703
font_01_sfnt_off0000e21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21D 11020 bytes
SHA-256: 2b6aaa14297f008932601726b79e80e9d6524c54f3cd091a4e59fa7e90a67131