Malicious PDF — malware analysis report

Static analysis result for SHA-256 937d03b63cb57f23…

MALICIOUS

PDF

84.3 KB Created: 2021-03-30 07:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ab1b7755442608870530c1a2ce11bb16 SHA-1: b78c2614d3d02ba0b4afae1a4fee89c1af948f41 SHA-256: 937d03b63cb57f2353747e5e477cb1c69ce69991b84eba77f89af67b3a3f8a4a
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The presence of many external URIs and the link farm heuristic suggest the primary goal is to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • 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://resalured.ru/strik?utm_term=george+foreman+grill+recipes+chicken+tenders PDF link annotation
    • https://tolonatapuxid.weebly.com/uploads/1/3/4/0/134042297/pitosurim_fakojotovili_morakajusonakaz_nawufaneduwisox.pdfIn PDF document text
    • http://femuxeririta.mygamesonline.org/altronix_al600ulx.pdfIn PDF document text
    • http://josumewemuzob.getenjoyment.net/20550052677.pdfIn PDF document text
    • http://lamaded.mywebcommunity.org/tixajutedogazevupuzenen.pdfIn PDF document text
    • https://ruwadegefanum.weebly.com/uploads/1/3/4/1/134108857/vitazil-fovegaxelined-guzorivu-xulavigojajanit.pdfIn PDF document text
    • http://kizunawinim.getenjoyment.net/7937544224.pdfIn PDF document text
    • https://metuliwilive.weebly.com/uploads/1/3/4/3/134386481/4741490.pdfIn PDF document text
    • http://kojazunupetip.mygamesonline.org/gologebafexozebajus.pdfIn PDF document text
    • http://kavelokafozi.medianewsonline.com/98943819804.pdfIn PDF document text
    • http://kudusakepupa.sportsontheweb.net/82032433134.pdfIn PDF document text
    • https://cdn.sqhk.co/kujusiru/jhcTCjh/photo_editor-_app_picture_art.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497370/normal_5fe5c1aebbdb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482405/normal_602e9ae3b330e.pdfIn PDF document text
    • http://rivepozepuxar.mywebcommunity.org/masterbuilt_30_bluetooth_electric_smoker_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/duzoxibuf/biiidij/lego_marvel_super_heroes_1_cheats_xbox_360.pdfIn PDF document text
    • http://bimovixexena.scienceontheweb.net/bwv_1052.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389084/normal_603e42f5b789a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495409/normal_6011762262bc9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vamavaremimot.atwebpages.com/biomass_briquetting_technology_and_practices.pdfIn PDF document text
    • http://forojiwimudobo.atwebpages.com/what_is_the_main_goal_of_the_sentencing_guidelines.pdfIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/download_materi_brevet_pajak_a_dan_b.pdfIn PDF document text
    • http://zupitatip.atwebpages.com/java_8_stream_map_string_to_long.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_off0000fbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDC 5452 bytes
SHA-256: 100ae80e04dff0c73057a85d58d60d86087a0440422b87b1482ce60f10412f48
font_01_sfnt_off00010e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E31 11548 bytes
SHA-256: 533d4f97ffb5cfe1fb6314ac94563b3b6cdf02c6d88ffe758d6c8027ebac47c4
font_02_sfnt_off00013573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13573 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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