Malicious PDF — malware analysis report

Static analysis result for SHA-256 5702e605310c672b…

MALICIOUS

PDF

93.8 KB Created: 2021-03-20 12:38:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0f8c3df4041717aebaad07ff5060d06e SHA-1: d51454e3c106b0c47535273c795fab067127322e SHA-256: 5702e605310c672be4a4f30a5f3ba93c5205bc9c6ae902a7f87f19a9e8409153
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The presence of embedded URLs and the structure of the PDF suggest it is designed to redirect users to potentially malicious content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/wix?keyword=minho+the+maze+runner PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472481/normal_603a41e8699c4.pdfIn PDF document text
    • http://pegejoruvufiron.sportsontheweb.net/developmentally_appropriate_curriculum_best_practices_in_early_childhood_education.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467004/normal_5fe50a8a9cd70.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403560/normal_5fdf2be6d1c61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369781/normal_6035103b22045.pdfIn PDF document text
    • http://bukawavado.medianewsonline.com/toshiba_code_for_universal_remote.pdfIn PDF document text
    • http://rifijetuvijilam.medianewsonline.com/threats_to_external_validity_in_research.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401976/normal_60245455e4d10.pdfIn PDF document text
    • http://libuwapuvewipev.mywebcommunity.org/silemerivela.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372682/normal_5ff569d1ac1c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481828/normal_5ff07455c6ebf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468270/normal_6028c4735da67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368970/normal_604d027b38e86.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423188/normal_5fc8b2f36a73e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454048/normal_60374645424cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448535/normal_600203b1569d8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vizomonuzujo.onlinewebshop.net/ratikek.pdfIn PDF document text
    • https://88bec3ce-9cdd-4818-a95b-bcf8ac49d1e7.filesusr.com/ugd/72df48_ddcabf6f8ea14338a2b49a65ea5c48ed.pdf?index=trueIn PDF document text
    • https://91506351-5699-48ce-85e7-8e7d071f4e87.filesusr.com/ugd/d775a9_d64142a23de2429a84deaffdcab8c338.pdf?index=trueIn PDF document text
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_bdef1a1b878b402f9d829fd68d944062.pdf?index=trueIn 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_off000135a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A6 4768 bytes
SHA-256: 456c10bd374882047bac7af1621075fa6ef9186c31d5245a295eb23775fa4a37
font_01_sfnt_off000145bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145BB 10508 bytes
SHA-256: 3908d15d6139e046987e997728d0693a81be3850f1efd33fcc351c308bb40c89

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