Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce6b763dc37ba1f…

MALICIOUS

PDF

51.4 KB Created: 2020-11-09 15:32:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c171b8ea2bff0ef7ad362a02a8410c24 SHA-1: 676e922ad55d38e6b1ebe568bbf11460ea797d8d SHA-256: dce6b763dc37ba1f0e5fb72b3d6ca88c2af49ab8c228fcbf2a0e93584576f805
126 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious websites. The ML classifier strongly indicated maliciousness, and the presence of numerous links on disposable hosting further supports a malicious intent. No scripts were extracted, but the document's structure and embedded links suggest it is part of a phishing or content-farming operation.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://trafffe.ru/aws?keyword=madden+20+manual+ps4 PDF link annotation
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/2c029f.pdfIn PDF document text
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/vakevav_sunemigizeme_mazasemekel_muzudatatalaxim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367914/normal_5f899ab49a589.pdfIn PDF document text
    • https://nupariredarig.weebly.com/uploads/1/3/4/3/134357859/sujenolu-sigexajobonaxu-zodutipimazasa-bijavanarija.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368970/normal_5f879d394bf7b.pdfIn PDF document text
    • https://mipolapepel.weebly.com/uploads/1/3/4/3/134395859/redapaxerozixin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383807/normal_5f92f7dced80b.pdfIn PDF document text
    • https://nanorobudilason.weebly.com/uploads/1/3/0/7/130775181/8432453.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365575/normal_5fa1f6640be32.pdfIn PDF document text
    • https://tuwebiparixe.weebly.com/uploads/1/3/4/6/134674666/8a93a07adf29.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/nabukukagifofe.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/30f313ef-8287-4774-b81a-648180c07707/57033588214.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bcf9041-1f5a-4e80-a866-767b9e8d241d/mitchell_middle_school_racine_staff.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_off000089e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89E7 5376 bytes
SHA-256: d9049108578c7d5ff3201850cecdc999a26187eee541cd6c3db93b4815d73614
font_01_sfnt_off00009c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C2C 10632 bytes
SHA-256: 41c0080ca083195b55172dd0734dba7db78eea4286ddf0a5c005c4e566301ce4

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