Malicious PDF — malware analysis report

Static analysis result for SHA-256 c40bb615aa70cb55…

MALICIOUS

PDF

62.1 KB Created: 2021-02-18 10:17:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: bbe46dc5a08a6d21626c70f7d0da255b SHA-1: 38abc9d2864b1090435a521f357f8711c57ec5a0 SHA-256: c40bb615aa70cb558e7db017653d3ca6fc44ec459aa14bdb5a2524c0a6ba229c
96 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains an embedded URL pointing to a suspicious domain, likely intended to deliver a malicious payload. The document body, though heavily obfuscated, suggests a lure related to educational materials, specifically a 'medical microbiology mcq book pdf'. The presence of embedded URLs and the overall detection profile strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/strik?utm_term=medical+microbiology+mcq+book+pdf PDF link annotation
    • http://tegonur.22web.org/24173611236.pdfIn PDF document text
    • http://lamorebeduzakoj.22web.org/technical_analysis_j_murphy.pdfIn PDF document text
    • http://gabameled.22web.org/tcode_for_stock_ageing_report.pdfIn PDF document text
    • http://lazadacostumercenter.com/415193120875syc8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://widafasamuj.epizy.com/bangla_typing_keyboard_for_pc.pdfIn PDF document text
    • http://zawagebojirowe.rf.gd/free_funny_ringtones_for_android_phones.pdfIn PDF document text
    • http://jawevobafepen.epizy.com/w-_4_deductions_and_adjustments_worksheet.pdfIn PDF document text
    • http://fekunowan.epizy.com/rossignol_ski_bindings_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/indian_passport_application_form_tanzania.pdfIn PDF document text
    • http://pejinubonuxus.epizy.com/android_application_developer_resume_format.pdfIn PDF document text
    • http://zaxowudupa.rf.gd/nonprofit_annual_report_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/3812834944.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/business_communication_essentials_5th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/cccp_codec_32_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/29861894494.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_off0000b655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB655 5732 bytes
SHA-256: a17e16d03ede03af09706bdc99f90fce4dadf6f03a631c6c9e47c9fcac4d4599
font_01_sfnt_off0000c9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D0 9848 bytes
SHA-256: 620590d9556789e097d045522626087f22c460a2e641e997506dd72af76b0ae1

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