Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ee2905e3b165f9…

MALICIOUS

PDF

74.1 KB Created: 2021-03-20 20:10:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 995ce6f5c6292aef781dac11ab105a34 SHA-1: 89499636baf12dc852159dbb36cf6de8aaf7f380 SHA-256: 51ee2905e3b165f9444e1b59b1cc3d14696c0fdb3017404155f79e3ad6fbc9e6
96 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document body, though heavily obfuscated, suggests a lure related to educational worksheets. The presence of an external URI points to a potential download or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/wix?keyword=stoichiometry+limiting+reagent+and+percent+yield+worksheet+answers
    • http://zefujixa.mywebcommunity.org/34730278005.pdf
    • https://xesusilinani.weebly.com/uploads/1/3/0/8/130874458/1563953.pdf
    • https://bewepuxajijasi.weebly.com/uploads/1/3/4/3/134362307/3315933.pdf
    • http://zokiwedilar.mypressonline.com/ecers_3_book_download.pdf
    • http://jidudilubad.mygamesonline.org/medical_certificate_application_form.pdf
    • http://rosativiwam.mypressonline.com/nemez.pdf
    • http://xapidomin.mywebcommunity.org/active_and_passive_voice_exercises_for_class_7.pdf
    • http://dodemul.mygamesonline.org/jidagimodusivuxu.pdf
    • http://gebigulexejo.sportsontheweb.net/xijononasok.pdf
    • http://buwovavozu.getenjoyment.net/51422064443.pdf
    • http://muwiduvepobuz.mygamesonline.org/effectiveness_and_efficiency_in_organizations.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nibemodida.myartsonline.com/gesagosasusavusetaj.pdf
    • http://mijovutotukedes.onlinewebshop.net/12061337723.pdf
    • https://uploads.strikinglycdn.com/files/635c7f61-327d-4120-9b33-853690b182eb/tilagigokenex.pdf
    • http://fazobelo.onlinewebshop.net/quadratic_equation_solver_online.pdf
    • https://uploads.strikinglycdn.com/files/4c298c9b-2415-421f-bf25-e9b6cc65c1d6/pingbingding_wa-2608_manual.pdf
    • http://ludugatitabi.atwebpages.com/pdf_marketing_planning_and_control.pdf
    • http://fazaburifug.myartsonline.com/69982614258.pdf
    • https://uploads.strikinglycdn.com/files/546c791a-824e-46c3-ac69-03cdb6c64c58/pathfinder_kingmaker_review_gamespot.pdf
    • https://uploads.strikinglycdn.com/files/ac6f8a4d-0a35-4162-8170-ff33aa8b5944/pepunajop.pdf
    • http://riveminigokoxa.myartsonline.com/valoxenerilo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e257.bin
d6c1e4e4d8eb682f9c3f62549e99e41f8d0d2b49b1cf473035f3ea8f829c2fc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE257 5848 bytes
font_01_sfnt_off0000f625.bin
fe498558fd74d0baa6b14d6df2000954c62cd7dbb1a95f6f2d972fae14343f10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF625 10608 bytes

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