Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b644f0a1f1e7403…

MALICIOUS

PDF

83.5 KB Created: 2021-03-22 23:54:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f52b836a6601d98d77d37381e788943f SHA-1: e2ce9571045558795a1deae910c2e9bee53ef86c SHA-256: 0b644f0a1f1e74030a66075aa34d925d354a0b680a53f477f275fd66b13bc38e
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The document body, though truncated and obfuscated, suggests a lure related to a book summary. The presence of an external URI and the ML classifier's high confidence indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/strik?utm_term=start+with+why+summary+chapter+14 PDF link annotation
    • http://nikibolerobika.getenjoyment.net/business_english_email_writing_sample.pdfIn PDF document text
    • http://davorivugexawu.sportsontheweb.net/ielts_target_band_7_full_version.pdfIn PDF document text
    • http://mazejofeg.mygamesonline.org/ways_of_seeing_book.pdfIn PDF document text
    • http://xonigej.mypressonline.com/48466275311.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/kewakuko/digital_marketing_manager_salary_san_jose.pdfIn PDF document text
    • http://nakarajibap.myartsonline.com/gakaxe.pdfIn PDF document text
    • http://jewofeket.onlinewebshop.net/bukhari_sharif_jild_1_in_urdu.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/zaxosejaxirisorubexaj.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/97074347608.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa5062c7-47d7-4bf1-8159-7ff35494d0fb/23446379115.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/531d224d-95e6-4fca-b946-555602b72108/how_to_write_a_paper_in_mla_style.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/tiwulizaruxovaja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ff9a95e-8f25-452f-a168-d165b90f7f13/galol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/215ef31f-0e50-4826-9f3a-9d9488066bdf/como_hacer_un_proyecto_de_investigacin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d35091ee-954d-415f-8f35-7bc58e11f77f/consolidated_dutchwest_federal_airtight_wood_stove_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/231bebae-a803-4cd2-a97e-f79b751b2545/cognitive_behavioural_therapy_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/ninna_birthday_kannada_song.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/jigijunamol.pdfIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/23002197508.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/jibomusiteg.pdfIn PDF document text
    • http://popofisofol.myartsonline.com/why_would_my_garbage_disposal_be_leaking_from_the_bottom.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_off0001068b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068B 5576 bytes
SHA-256: 0efc96ae8877ec5a8a7beefca2388bec3fe439ca83297e2d01d87e1a129a8581
font_01_sfnt_off0001197d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197D 11608 bytes
SHA-256: 17c58a13183c532e413e8be0d5030bb2f76406bc34880a0b25e0464ab5d90553

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