Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9609cf41c7c0632…

MALICIOUS

PDF

80.4 KB Created: 2021-02-27 20:53:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1da5679a9bb1af8c98a7f6374b5917e8 SHA-1: 781f8ead4ab874d0576d0c8810b405ebb6be104a SHA-256: b9609cf41c7c0632a63cd74fcb880732484d6c90f3a0a0c98beba2e6291c2971
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, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'bologen.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically to appear as a legitimate download link.

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
  • 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://bologen.ru/aws?utm_term=la+biblia+app+gratis PDF link annotation
    • http://tonedomopoja.scienceontheweb.net/how_to_crack_minecraft_2020.pdfIn PDF document text
    • http://nefozufovi.scienceontheweb.net/line_6_pod_xt_live_effects_loop.pdfIn PDF document text
    • https://cdn.sqhk.co/xiwasazafu/wfKUnib/kifofez.pdfIn PDF document text
    • http://veviwumifuvemuz.mypressonline.com/understanding_financial_statements_for_beginners.pdfIn PDF document text
    • http://sodahq.club/best_price_epson_1430_printer06ef6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gomakobez/36876037392.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/crystal_reports_data_types.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/multiplication_division_fraction_word_problems_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/payroll_accounting_system.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/89789446497.pdfIn PDF document text
    • https://s3.amazonaws.com/rejiner/appraisal_answers_for_managers.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/ableton_suite_8.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/89755256590.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/18491188487.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/92843328553.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/naming_acids_worksheet_hno3.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/36109344682.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_off0000e786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE786 5068 bytes
SHA-256: 25423f8255e8f0ef8c684d820ece851f339096098cf457514cc2caea5c30e7f2
font_01_sfnt_off0000f8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CF 11284 bytes
SHA-256: 51d316af3341ef4f6ad7bedd3f3f8dda0e24f4cc14b9d43115d7dbebb3f8b35d
font_02_sfnt_off00011e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5D 16488 bytes
SHA-256: fdca2bcffda5f6a23f42ba9255e29875b3da0086e7e5b87450e035a526f36ec5

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