Malicious PDF — malware analysis report

Static analysis result for SHA-256 567613bfb4daac86…

MALICIOUS

PDF

76.4 KB Created: 2021-02-14 12:56:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: b19ee01b2608e47dadc5f4ea7c224045 SHA-1: ed1fa9c5122d5cc60100da5552a60445feaea9a8 SHA-256: 567613bfb4daac86cab85e96eeac2f62bb17546d1d928b75597d35d249cf6f5f
156 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is part of a link farm and hosts external URIs, with one URL being a potential phishing or malware distribution site. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a social engineering attack to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/123?utm_term=stupid+test+level+2+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382414/normal_5ff58adb15793.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459034/normal_5fdf47a4e8b02.pdfIn PDF document text
    • https://nebelifufenav.weebly.com/uploads/1/3/1/4/131437331/e35cb167ff78cb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408601/normal_600fcb26bf192.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/dialogue_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/software_performance_analysis_tools.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/resume_templates_for_software_engineer.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/tavemasowomarezumegitepo.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/visual_studio_2017_crystal_report_designer.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/jevume.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/microsoft_spider_solitaire._exe.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/jepedifupazeju.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/oracle_sql_developer_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/10153205379.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/pumpkin_carving_templates_faces.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/ielts_8_listening_test_2_answers.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_off0000eba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA9 5340 bytes
SHA-256: 437073537e16eff793558057902289413c992cacd7d6eb65583c33d8cf5fa05e
font_01_sfnt_off0000fdf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF7 11476 bytes
SHA-256: dfa5249ba359790059c63188729fac281b5a01542459e217ba758d553eed5172

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