Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb21b25805f1e280…

MALICIOUS

PDF

87.6 KB Created: 2021-04-03 18:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: c21df37be474055ca2d45029e8dfdbed SHA-1: 1548238c8f4748b5261813414c9cf01f8efab0f3 SHA-256: bb21b25805f1e2803f4e142391ecbdafac4cee4236ad2acc9e89d77855c8a661
96 Risk Score

Malware Insights

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

The file is a PDF with a high ML classification and ClamAV detection, indicating malicious intent. It contains an embedded URL pointing to 'mezovuduw.ru', which is likely used to deliver a malicious payload or conduct phishing. The PDF structure itself does not contain executable scripts, but the presence of external URLs and the overall detection profile strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://mezovuduw.ru/123?utm_term=vcds+lite++full PDF link annotation
    • https://cdn.sqhk.co/letarezetap/PibLjcP/clothes_worksheets_clipart.pdfIn PDF document text
    • http://xebubux.sportsontheweb.net/dowry_system.pdfIn PDF document text
    • https://filukekab.weebly.com/uploads/1/3/4/4/134478490/pirobel.pdfIn PDF document text
    • https://besugadofozoxi.weebly.com/uploads/1/3/5/3/135396803/2a9a5457.pdfIn PDF document text
    • http://tujubafi.getenjoyment.net/66698082497.pdfIn PDF document text
    • http://retapadu.medianewsonline.com/minezotifumuwaretajava.pdfIn PDF document text
    • https://cdn.sqhk.co/butituguxur/jjNwiba/18224554361.pdfIn PDF document text
    • http://medazuxa.mywebcommunity.org/10324334544.pdfIn PDF document text
    • https://cdn.sqhk.co/figesuweno/2ihj2LP/taiwan_visa_application_form_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/xeposetuge/bggEMji/pupps_rash_on_feet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/433f4edb-67e9-48a5-afe0-8f876d50a2b9/1793865703.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/pomifiradofajavuvo.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/aluminium_corrugated_sheet_dimensions.pdfIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_48da64c51209407489c879700d8699ab.pdf?index=trueIn PDF document text
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_34e4b6649f974b92aaf68d947121d599.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kujapomib/departmental_test_answer_key_january_2016.pdfIn PDF document text
    • https://e3e1c2aa-7f41-47b0-8c2f-d823cb48b857.filesusr.com/ugd/7598fa_30120f5e5e984f6b8264674297eb1627.pdf?index=trueIn PDF document text
    • https://878ee1be-828d-48b9-a24a-84283cf66a1c.filesusr.com/ugd/86936c_ec7942182e204ab593646df0f35b4f72.pdf?index=trueIn PDF document text
    • http://letutemoxeluz.onlinewebshop.net/define_selective_incapacitation.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/husqvarna_372xp_for_sale_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec1b47cb-60d6-445f-bfd2-69f5e9da22ac/libro_de_los_sueos_significado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6863f322-7062-4af1-b6cd-1cc132b67b9a/jolovewaromonovafedelu.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/iphone_xs_max_wallpaper_full_hd.pdfIn PDF document text
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_10f3e29d65a747bf98e86f48a09c3829.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E3 2912 bytes
SHA-256: ca76997379172eee33085c8482c7323aa4c6490e5d9b0518affecd078e7eaab7
font_01_sfnt_off00010b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3F 4672 bytes
SHA-256: 36d688bfd476969507557053e25ec35071ef47da9f3bfc84a225d8909c03a56c
font_02_sfnt_off00011b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3F 17104 bytes
SHA-256: bfa9928d6064e0a5300242576247a481c7981002ec9f072cc4222d695f9303f5

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