Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c87a74635bc7fd0…

MALICIOUS

PDF

79.6 KB Created: 2021-05-22 03:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: aa0814f90761ceb23dca590b84dd4220 SHA-1: 507290ec9d952a5657bf987c812d3b353ff50cf0 SHA-256: 6c87a74635bc7fd02523e1c316bf094525ac5eef84d7ea7852492c76d301ff51
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 0.9998

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://druttle.ru/strik?utm_term=how+to+beat+willy+wonka+slot+machine PDF link annotation
    • https://dapadode.weebly.com/uploads/1/3/4/6/134646205/3f24a6c477.pdfIn PDF document text
    • https://didegesub.weebly.com/uploads/1/3/2/6/132681352/pojusovoz-begulikas-samutafugusewa-jopuwudiminado.pdfIn PDF document text
    • https://seserasug.weebly.com/uploads/1/3/4/6/134678868/4898404.pdfIn PDF document text
    • https://dasajusowerav.weebly.com/uploads/1/3/1/6/131637273/74e26b5ffb.pdfIn PDF document text
    • https://tegikokawotivax.weebly.com/uploads/1/3/4/7/134759165/zudivowesiginaxoje.pdfIn PDF document text
    • https://riwumoba.weebly.com/uploads/1/3/5/9/135965326/2347691.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/8478dab7-60d8-4811-adec-2989775cc164/how_do_you_know_theres_something_wrong_with_your_kidneys.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/amazon_flex_app_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/beyblade_burst_song_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/husqvarna_455_rancher_carburetor_rebuild.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63f26547-0aac-4c87-97c0-b14c998b4225/plagiarism_webquest_quizlet.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/43514831184.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/didob.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/counter_strike_1._6_offline_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33350887-7517-49eb-a425-9adade91aa15/912680149.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/73438675106.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/walaxejewo.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_off0000f972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF972 5304 bytes
SHA-256: 48cc4f959c36f609f24967e312dc8ef682d982ecb9fb878cf378caf9896ab374
font_01_sfnt_off00010b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6E 11144 bytes
SHA-256: b73ea32f4aad690cf2ce84f348f529699a8ad4ca3b72d1ed83171ca7a8c590fc

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