Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c32d1d3dcaf82b3…

MALICIOUS

PDF

41.9 KB Created: 2020-10-15 12:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 2970f7424bc791d86479654a3c9ec0ac SHA-1: 13ed848cacfb467ccfcd1dd429df7c276bdf20aa SHA-256: 5c32d1d3dcaf82b33e6be07ca3ced0f69fbbe847e7f0977605e20efe4b4bce06
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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 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.
  • 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=healthcare+acquired+pneumonia+guidelines In PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/caa64.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/5473886.pdfIn PDF document text
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/5413437.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/ramugimexixepaba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5f87bf3d60972.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366043/normal_5f87397b1a2a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368481/normal_5f87e79346f17.pdfIn PDF document text
    • https://vuzevarezevarot.weebly.com/uploads/1/3/0/7/130740461/3a6af17.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/tugunari_fogeze_nezejavoz.pdfIn PDF document text
    • https://site-1038768.mozfiles.com/files/1038768/72830301923.pdfIn PDF document text
    • https://site-1038825.mozfiles.com/files/1038825/bibisuf.pdfIn PDF document text
    • https://site-1037121.mozfiles.com/files/1037121/12763514981.pdfIn PDF document text
    • https://site-1038494.mozfiles.com/files/1038494/11814650407.pdfIn PDF document text
    • https://site-1039737.mozfiles.com/files/1039737/86683594092.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5f874cfa38d2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365612/normal_5f87146f3d799.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5f8766ce394ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366057/normal_5f8707e5238e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365657/normal_5f8701e92dac3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000063b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63B8 5572 bytes
SHA-256: 3fb41a68544d3eb309d7d08daf98ba2d4711479bbcb8e862bda7579ac2b96f49
font_01_sfnt_off0000766b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x766B 10848 bytes
SHA-256: c36d326d9ccbfc98820ba7b106bcf3444582373fa5e6cc159c60a61b2043e7e8

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