Malicious PDF — malware analysis report

Static analysis result for SHA-256 91dcf79f9738c535…

MALICIOUS

PDF

73.4 KB Created: 2021-03-09 01:08:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bf382ae5c8ba74d41b2dd66e4b91ac04 SHA-1: 974ea0d9e8ca783986088653fd206fcccfd4ea52 SHA-256: 91dcf79f9738c53559897471028d33056ed9ad84e22cebffaecdfb8f44c08016
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/123?utm_term=avengers+hd+wallpaper+1920x1080 PDF link annotation
    • http://duzatizej.iblogger.org/zizubovelaresogirobax.pdfIn PDF document text
    • https://loxajutuwaguxi.weebly.com/uploads/1/3/2/6/132681393/3165082.pdfIn PDF document text
    • https://zivejopoji.weebly.com/uploads/1/3/4/2/134266783/817707e43.pdfIn PDF document text
    • https://xakewalite.weebly.com/uploads/1/3/4/8/134882175/f345b5.pdfIn PDF document text
    • https://vegonivi.weebly.com/uploads/1/3/5/9/135986737/fipuxunojipurinotivi.pdfIn PDF document text
    • https://kebuwusatame.weebly.com/uploads/1/3/5/3/135343151/7576769.pdfIn PDF document text
    • https://dafalozurevibi.weebly.com/uploads/1/3/4/3/134308304/389be4b10cb24f.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/gelawiweza/reporte_averias_cnfl.pdfIn PDF document text
    • http://nekexixi.epizy.com/administrative_law_course_outline.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/baby_scanner_camera_apps.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/68783992177.pdfIn PDF document text
    • http://vaguwiraji.rf.gd/rectangle_surface_area_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/tumuzu/real_book_6th_edition_bass_clef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5656877c-a1cd-4981-b80b-c71cab9425b0/63516816626.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/how_to_change_kali_live_password.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd874c33-dead-45f1-aae0-0f02e8d34712/retemuxiximamebumofename.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0a34a63-155f-483f-ba03-5b4bbb57c97c/vitamix_5200_blender_parts.pdfIn PDF document text
    • http://vovuvap.rf.gd/best_antivirus_and_cleaning_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/62075203807.pdfIn PDF document text
    • http://natomig.rf.gd/batangas_state_university_senior_high_uniform.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/869c6969-5702-4082-a887-7757257514b0/what_is_factor_rating_method.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_off0000df6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6D 6108 bytes
SHA-256: 0aec0e5235f1726a26da362376f44e2ddcaab4e27ed803d7530b92348b9510cc
font_01_sfnt_off0000f448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF448 10412 bytes
SHA-256: 4ce2a98d08528a46a6ce8bd67b821d1e80597e412e55cdfc98c4cf01b2b47d7f

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