Malicious PDF — malware analysis report

Static analysis result for SHA-256 1576d94226edcc81…

MALICIOUS

PDF

76.1 KB Created: 2020-12-01 23:55:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 68ed07e7ddc4717a014a5d7a5b237479 SHA-1: ebe7d8734578418470f421dcd65629db12d761bf SHA-256: 1576d94226edcc8128c48cc7bd93b4d9eeced3ed69ad3738a57f7a58f1158c6d
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure, specifically pointing to a URL that attempts to deliver an Android application. The ML classifier also strongly flagged this PDF as malicious. The embedded URL is designed to trick the user into downloading a potentially harmful APK file.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://cctraff.ru/strik?utm_term=t%25C3%25A9l%25C3%25A9charger+emoji+font+3.apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4415543/normal_5f9aff224cfaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383304/normal_5f8e286e38b8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474478/normal_5fb60f4b52ff5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370288/normal_5fa2c5a6ddb7f.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/c937ea68-dd4a-48c9-929c-e2a95d058b2d/lonolelonepevagenel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adc02ffb-064c-4f4a-baa8-f15106638908/43324475781.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04233de2-252e-4da3-aa0a-dfb08e5c82f1/burda_magazine_download_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bixumiburi/paris_lee_bennett_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09813a9f-98cc-443b-9e20-7aeb07a6ff58/88166123244.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e01f2cf09257bd6be9c2/t/5fc3fd8e3c02f22b9d88e7da/1606679950445/acceleration_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5eb9a48-8a5e-4be4-955a-a437eecf0f8e/yandere_simulator_guide_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4421df71-7e5d-42a6-a123-df0a340cd2aa/potesinufanijodoxi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcee67edabee7b4405fab0/1606217319903/framaroot_apk_descargar_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17717a47-ac30-410a-920c-941d0916072c/fnaf_1_map_minecraft_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/025a1da1-0c13-43c8-8a60-250cf1f9f121/jelomarukirovijedutikini.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_off0000e637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE637 5680 bytes
SHA-256: 484bdccc47291529f3b42b039d834ff28e9441413e0fa746109aad429228d247
font_01_sfnt_off0000f92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92A 12548 bytes
SHA-256: b7e98be263232e8d4c1bd43263c8f8609a43355e4785f40cff13942d7132e243

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