Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b67bb4b01199c2…

MALICIOUS

PDF

42.6 KB Created: 2020-11-07 22:06:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 6dd83babf1dc2a36e28cf7e79fb764c7 SHA-1: 1afab7383ea87f39609269531a98100e2eec6d5a SHA-256: e5b67bb4b01199c267eaeb7a6337f3a1655b2448a6e3a93618d113711b02cb3e
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://traffmen.ru/aws?keyword=2+stupid+dogs+tbs In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366331/normal_5f89ad2b55a1a.pdfIn PDF document text
    • https://ziripovopibew.weebly.com/uploads/1/3/0/8/130874468/267f068d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://manetomimexa.files.wordpress.com/2020/11/68091325827.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/normal_vector_of_a_plane_python.pdfIn PDF document text
    • https://wemusule.files.wordpress.com/2020/11/visutera.pdfIn PDF document text
    • https://sovezetazej.files.wordpress.com/2020/11/41948831472.pdfIn PDF document text
    • https://saridejawe.files.wordpress.com/2020/11/63474122853.pdfIn PDF document text
    • https://zudevize.files.wordpress.com/2020/11/difference_between_agglutination_rouleaux_formation_and_clotting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f505db1b-3974-47a3-b96c-14233fb8fce4/ninojevabevosujem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a29b8246-bfe3-49b0-aac1-d3598cfffb27/tajeteditotov.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_off000068d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68D2 4964 bytes
SHA-256: 2877f1cc4968f89d8d298f16bf529ab79c589cbdc0f63384227400a219f18207
font_01_sfnt_off000079c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79C2 10748 bytes
SHA-256: 6f6f6ce9992a06f0ee5bd7cc4076cd281eb2018c3bf22902b158f22283270d00