Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca1aa64fd2ecc41…

MALICIOUS

PDF

81.9 KB Created: 2021-03-24 12:08:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 902c1eaa5a8cb0c782108c7498726c90 SHA-1: 92afc30a93f30511b2d4c3deafe28e2d2ff67b02 SHA-256: bca1aa64fd2ecc418f527bd55f7c859140d268f3620caf1ce2f716ac6ccc1f2a
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with a high risk score. It contains an embedded URL pointing to 'zajinet.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to 'healthy fruit and vegetable smoothie recipes'. No scripts were extracted, but the PDF structure and embedded URLs indicate a phishing 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://zajinet.ru/strik?utm_term=healthy+fruit+and+vegetable+smoothie+recipes+for+weight+loss+philippines PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4493245/normal_5fcaf76998a78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475864/normal_5fd5ff6ecf58a.pdfIn PDF document text
    • http://help-copyrightviolationhelpcenter.com/wanopupaburo6bjra.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376850/normal_5fe2db16af7dd.pdfIn PDF document text
    • https://cdn.sqhk.co/gavezexu/g4R3cVf/poly_performance_synergy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479226/normal_600703ba72b6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446494/normal_6052d5d2bee0a.pdfIn PDF document text
    • https://cdn.sqhk.co/muwazubivotu/jhhiMgg/savabolowi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411714/normal_5fe24632e3688.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372104/normal_60017d5bd02f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373983/normal_60518bb54a5a4.pdfIn PDF document text
    • http://nesobaka9.xyz/al_quran_mp3_free_download_for_mobileeggnp.pdfIn PDF document text
    • http://cuzinfo.ru/historia_del_mundo_contemporaneo_1_bachillerato_santillana10mg3.pdfIn PDF document text
    • http://stileidmo.fun/badland_2500_winch_wiring_diagram5g9l1.pdfIn PDF document text
    • http://frut-tree.site/what_games_to_play_with_8_year_olds99cxp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368978/normal_6031261118a8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449406/normal_5fc72cd12c2a7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000101e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E8 5924 bytes
SHA-256: 6f09cf2e32d680e2e5fb9b0d11c99dfeee45bd71998f98fc90863ba2fac172d6
font_01_sfnt_off00011604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11604 10484 bytes
SHA-256: 1644e31a8c92e592f2eb6628930d7f6bc511c30d93f4ecf754ff49f3e27561bd

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