Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3528db27fe4f4b…

MALICIOUS

PDF

42.8 KB Created: 2020-10-01 14:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: c5e178896bfb866c944dcb4ae7e4a96c SHA-1: 33357ce38c3871cec067ac7258525c412acf6d10 SHA-256: 5f3528db27fe4f4b7d68d91a86efd745396298005a2eb3ef00976afd648e055c
132 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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://ggtraff.ru/strik?keyword=ejercicios+asientos+contables+pdf In PDF document text
    • https://site-1036867.mozfiles.com/files/1036867/15746820351.pdfIn PDF document text
    • https://site-1039779.mozfiles.com/files/1039779/dixogurugijorovavo.pdfIn PDF document text
    • https://site-1036767.mozfiles.com/files/1036767/wapasasodufipesidopu.pdfIn PDF document text
    • https://site-1036646.mozfiles.com/files/1036646/nagakapifonomaresevakovig.pdfIn PDF document text
    • http://zuxowaz.positiveimpact4health.com/uploads/1/3/1/3/131398274/megulejijuro_tetin_fepozawi.pdfIn PDF document text
    • http://files.doctormabuse-themovie.com/uploads/1/3/1/4/131409385/vukegi.pdfIn PDF document text
    • https://site-1036779.mozfiles.com/files/1036779/zebugevaveguve.pdfIn PDF document text
    • https://site-1037178.mozfiles.com/files/1037178/36945226816.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
    • https://uploads.strikinglycdn.com/files/0d0c85d6-310d-4200-8a60-672c3d5a4555/14998466322.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38f2ad2f-ca93-4b7c-81b5-3c358e5afa54/gulujikelipekexiwiwob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f38256cd-3819-48c1-9419-2d860dd17e17/66564761853.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_off00005bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BBD 5112 bytes
SHA-256: af708492afa05329e9b8a0e5ddc333c85772f2b881683e8177db6bd55d0b796d
font_01_sfnt_off00006d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D22 10896 bytes
SHA-256: e073665301a161d27e69b89a2cb51bb3ad9b0a79558ec2c0c6eb93781d1c2dc4
font_02_sfnt_off00009092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9092 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333