Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72dbe5a5349213b…

MALICIOUS

PDF

77.4 KB Created: 2021-02-15 06:18:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: c5f2ce3c40461adcecedd48947a36aec SHA-1: 5f6286746512cae64e61bc83c92d5f0ae133eedd SHA-256: b72dbe5a5349213bc41ad73622fac9b3a3a6bfb94d3cdfa3c75af48daf2ad6ce
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, contains references to 'integers worksheet for class 6 pdf' and is associated with an external URI pointing to a suspicious domain. This suggests a phishing or social engineering attack aiming to direct the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/aws?utm_term=integers+worksheet+for+class+6+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426556/normal_6020fab92b977.pdfIn PDF document text
    • http://preplafond.xyz/bluestacks_app_player_x86_32_bitxn383.pdfIn PDF document text
    • http://50offshop.pro/danza_moderna_y_contemporanearnst9.pdfIn PDF document text
    • http://videohost.space/22629346125zfwgs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491432/normal_601b7e232c7e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423427/normal_5feb6e8b8233c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415525/normal_600167fc10f8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502493/normal_5fd0be0bde19d.pdfIn PDF document text
    • http://fumigatoff.online/murozuxafwbi4h.pdfIn PDF document text
    • http://soldonlittleton.com/bezudolalowasflga.pdfIn PDF document text
    • https://cdn.sqhk.co/gubisagebuto/hy9UChi/equalizer_apo_microphone_noise.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447437/normal_6004415683e14.pdfIn PDF document text
    • http://fragcups.com/95365418623ligd9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377925/normal_5fdf009e72c6f.pdfIn PDF document text
    • http://vinnipoh.space/90705758737a2ryo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://renizovakosa.epizy.com/zenly_apk_pure.pdfIn PDF document text
    • http://jiropikadebu.epizy.com/satavemofebewafunino.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF7 5404 bytes
SHA-256: 6512c9e85831cf1c52e45fafefed4207ed19ad898c8a3c3c867c37aad61cb1b2
font_01_sfnt_off0000de61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE61 11236 bytes
SHA-256: ada5a75e87cb6da2069fc35067dfc287cc65f9f5200ad261facca858a104c41c
font_02_sfnt_off000104f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F2 16164 bytes
SHA-256: c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e
font_03_sfnt_off00011a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A07 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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