Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c25a4b7ccea3903…

MALICIOUS

PDF

49.3 KB Created: 2020-10-07 22:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: 6c19b0a2e4f8855b0c1ad261b16b8f45 SHA-1: 15f85e71af3e3717d54415cebcc52653ee903ea7 SHA-256: 7c25a4b7ccea39038c425904f996704c38444c1b84dee9d524cbb4b14d2a7aed
124 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?keyword=logstash+output+elasticsearch+template In PDF document text
    • https://site-1038439.mozfiles.com/files/1038439/65102281883.pdfIn PDF document text
    • https://site-1043536.mozfiles.com/files/1043536/fegel.pdfIn PDF document text
    • https://site-1048471.mozfiles.com/files/1048471/2206766915.pdfIn PDF document text
    • http://dapejufi.mshawncornellstudio.com/uploads/1/3/1/3/131383548/xunisagajexi-taregidam.pdfIn PDF document text
    • http://files.jillstarlingnovels.com/uploads/1/3/1/3/131383247/paxuxerebenan_rapafadasaxub.pdfIn PDF document text
    • http://files.rhythmandbeans.com/uploads/1/3/1/4/131406253/a3d2647eb735.pdfIn PDF document text
    • http://vavepu.weekendarting.com/uploads/1/3/1/1/131164174/nasumozezase_xinuwagogunima_lopijisin_xudetanu.pdfIn PDF document text
    • http://files.mrjcostello.com/uploads/1/3/2/7/132711983/6610048.pdfIn PDF document text
    • https://site-1037212.mozfiles.com/files/1037212/mugugifemabujat.pdfIn PDF document text
    • https://site-1036960.mozfiles.com/files/1036960/28367598656.pdfIn PDF document text
    • https://site-1036719.mozfiles.com/files/1036719/1367283420.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/40d64071-5866-462b-8b55-b568f867de38/wofesip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a4d0420-bbb4-4af7-857b-65eacd8fba93/21135580564.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a0ae8a5-9455-4e85-88db-9ada0b0a4b41/mifepawekixuwuzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81088c9c-e803-412d-9929-6bd2eb75d496/2817200844.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4bb8624-fdd8-4c24-8284-f6e99b177e8b/vugep.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_off00006f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F32 4096 bytes
SHA-256: 79c4376687d98ccc606ff3f4292b8ed5f05aa88773fcd7a3832dfca6e7f7751e
font_01_sfnt_off00007db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DB0 5288 bytes
SHA-256: 90ce4b0c57353e48d04cb8aa34c373821d3bcdc548173ea3741622a46df71188
font_02_sfnt_off00008f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F8C 12188 bytes
SHA-256: 89a7889046b2712ce4507103f264fac5877e37f2feb20df19ac2c55fec175449