Malicious PDF — malware analysis report

Static analysis result for SHA-256 d451caaa453ff4ab…

MALICIOUS

PDF

71.6 KB Created: 2021-03-23 20:32:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: b85a25341d975437c2761f1e2d3f3f91 SHA-1: 5f93f3206d415ddc0a2e4a0f7b7ebbe95b1c5d5c SHA-256: d451caaa453ff4aba550ed42a1177713b1c5c1c2df2c3521844a2a2465a4dcfe
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URI pointing to 'jacksth.ru', which is presented as a Microsoft Azure certification roadmap. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest a phishing or malware delivery attempt, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/award?keyword=microsoft+azure+certification+roadmap+2020+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450259/normal_5fe7b32cb9b98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479925/normal_6029fc237ee43.pdfIn PDF document text
    • https://cdn.sqhk.co/rokogikapo/gd6099U/flip_range_mod_apk_revdl.pdfIn PDF document text
    • https://cdn.sqhk.co/kifavubivelo/hjfjclD/capital_fund_management_australia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456134/normal_5ffe9ab5a2658.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/jhhbz3p/dragalia_lost_wiki_facilities.pdfIn PDF document text
    • https://cdn.sqhk.co/pifizumux/vicidhg/ff_live_streaming_sekarang_rcti.pdfIn PDF document text
    • https://cdn.sqhk.co/fijufupuga/hyheDgj/6077399671.pdfIn PDF document text
    • https://cdn.sqhk.co/bevoletef/jdiaEgh/tenizagovumuzaxaregaliner.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nibejodawugizex.rf.gd/business_plan_for_software_development_company.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6251040b-3904-4273-b978-6d9cfeb8f5a4/los_5_lenguajes_del_amor_para_ninos.pdfIn PDF document text
    • http://goxebobepi.epizy.com/fogenovuwexag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff52b18a-3cf1-43a2-bfe1-cee6a5fc805c/dungeons_and_dragons_5th_edition_unearthed_arcana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdca7072-8168-4841-9f57-3b5671eb39b2/58084044088.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d8e02a9-13eb-4d66-82fc-6cc3f4d4f0de/what_is_the_english_legal_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe23ecab-0183-4723-825a-34c74bc861e0/63355777576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33c0c026-35bb-4246-840d-f7965fbc567b/how_to_reset_skyscan_atomic_clock_model_28900.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_off0000db09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB09 5596 bytes
SHA-256: 3913324226b6d6b8ac9a0f46c98be9788ef3c6017e7adae241c4a0812e243d5c
font_01_sfnt_off0000ee10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE10 10280 bytes
SHA-256: 26ea2972f69f57c8e6b7caf80b0ad778b2b08da62d704a03dfefc873473cd0ae

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