Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f1a6a18827762a…

MALICIOUS

PDF

89.2 KB Created: 2021-03-16 07:32:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b31418e11540f9b13f2b85de19a845f3 SHA-1: 4938a278aae8d3dadb25539a86dc712108561907 SHA-256: b8f1a6a18827762a2f9717db4f6d58d961660070cedf5f1cf3fd923d0c2f8709
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to a suspicious domain, which is likely used to host a phishing page or download a secondary payload. The document body, though heavily obfuscated, suggests a lure related to 'Endgame theme piano sheet music'. No scripts were extracted, but the presence of external URIs and the malicious verdict strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://xajibur.ru/123?utm_term=endgame+theme+piano+sheet+music PDF link annotation
    • http://leoidet.xyz/jvc_kd_r740bt_change_colorkroow.pdfIn PDF document text
    • http://subonus.ru/melodious_etudes_for_trombone_freeh1s8n.pdfIn PDF document text
    • http://kinoxca.xyz/884368029848n14w.pdfIn PDF document text
    • http://naturagrush.space/xarijofidejolupizg8a5.pdfIn PDF document text
    • http://zatoboyvibor.fun/another_word_for_visualkr0uu.pdfIn PDF document text
    • http://muziwufugo.22web.org/rastafarian_prayer.pdfIn PDF document text
    • http://fikosarodone.medianewsonline.com/camino_primitivo_gronze.pdfIn PDF document text
    • http://zilofunawoson.iblogger.org/is_there_a_grace_period_for_license_renewal.pdfIn PDF document text
    • http://fisogik.iblogger.org/75320877822.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ziwivazud.onlinewebshop.net/nikon_l35af_af_review.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/android_adb_driver_installer_for_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/viridojufimususesiberun.pdfIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/sexevufefoviro.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/agree_tool.pdfIn PDF document text
    • http://dojiseb.epizy.com/apps_programmieren_android_tutorial.pdfIn PDF document text
    • http://pojozija.onlinewebshop.net/how_to_connect_behringer_x32_to_computer.pdfIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/gcse_biology_quiz_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/pdf_ausfllen_und_unterschreiben.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/9912535079.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/the_lovesong_of_j._alfred_prufrock_analysis_line_by_line.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/72930360701.pdfIn PDF document text
    • https://s3.amazonaws.com/sogovekevi/10562936016.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/the_expanse_season_6_air_date.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001088c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088C 5316 bytes
SHA-256: 75702b97841c445a38d478bfc55a050547aefb317a59be48c820b39c37498e80
font_01_sfnt_off00011a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A87 11780 bytes
SHA-256: a3eea05b74cc531e4d56175d2c0e1ae48583c14da9b8c3c7650609d6f83311f4
font_02_sfnt_off00014234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14234 16100 bytes
SHA-256: 84650fe671c70ac66f3af0994468c9b9feb42d01905b0f030d5781e095ef8e52

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