Malicious PDF — malware analysis report

Static analysis result for SHA-256 96c6e3e635fae25d…

MALICIOUS

PDF

81.9 KB Created: 2021-05-15 17:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 26d54cafc4cc08c3e267a853dfcaa04f SHA-1: 52bd9935fbca84868492399d4913fff0111920bf SHA-256: 96c6e3e635fae25d15916594388fc9b6b3005ecccda6c995bb0623885e898b35
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'Rat feng shui lucky colors for 2020' and authoring information indicating it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://botokaw.ru/strik?utm_term=rat+feng+shui+lucky+colors+for+2020 PDF link annotation
    • http://warowusavi.mywebcommunity.org/learn_amazon_web_services_in_a_month_of_lunches.pdfIn PDF document text
    • http://reduslim-europa.site/fifty_shades_of_gray_trailer_in_hindiuxvsi.pdfIn PDF document text
    • http://suporefebakibur.mygamesonline.org/dinike.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/elaborated_and_restricted_codes_bernstein.pdfIn PDF document text
    • http://xolokukifimiv.sportsontheweb.net/luis_vaz_de_cames_biografia.pdfIn PDF document text
    • https://sufudoni.weebly.com/uploads/1/3/4/8/134853368/3028902.pdfIn PDF document text
    • http://vikolumubibo.scienceontheweb.net/b._com_sem_6_books_gujarat_university.pdfIn PDF document text
    • http://saudiautoinsurance.com/canon_in_d_piano_sheet_music_easy_with_lettersgpzf8.pdfIn PDF document text
    • https://tiwebusimevadeb.weebly.com/uploads/1/3/5/3/135346158/gebevuzuv.pdfIn PDF document text
    • https://fajuvupo.weebly.com/uploads/1/3/5/3/135310445/3193959.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/zagaxupokosuwivedi.pdfIn PDF document text
    • http://kesuvajeb.scienceontheweb.net/one_punch_man_gym_scene_episode.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/2ca37cbd-d1c3-4838-ae9f-5f1df228f1c2/para_que_sirve_la_vitamina_d2_ergocalciferol.pdfIn PDF document text
    • http://kepagewav.atwebpages.com/xovabasawopevisu.pdfIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_03dbfd7ffe5b4422a16a9ee0c3d7c352.pdf?index=trueIn PDF document text
    • https://a0bbd489-bf03-48a0-8e93-88abd0751e5b.filesusr.com/ugd/370ea2_46ef15cc28d54f72a71aa687f1123998.pdf?index=trueIn PDF document text
    • http://pikubub.onlinewebshop.net/fossil_q_explorist_hr_gen_4_charger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2c5ad59-7401-43b4-8a4e-0cc3c41e5794/how_does_ff7_remake_differ_from_original.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF220 4532 bytes
SHA-256: 9ab40011cf34333adc36bdee67eeb5a45fbd89d2c20db628115cefadc26fdb92
font_01_sfnt_off00010209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10209 5592 bytes
SHA-256: 1bd383b16f6cc351fa4137c46ee7427c55c083b44e18e05554cc9c8bca3484ae
font_02_sfnt_off0001151e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151E 11672 bytes
SHA-256: 51f7197d32f80532fe5f89a1b50ef33095585c7ade7a0bb705a5bb96448ecb29

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