Malicious PDF — malware analysis report

Static analysis result for SHA-256 9830b4f7594bedc7…

MALICIOUS

PDF

66.8 KB Created: 2020-11-17 22:27:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 94334beada96c47577e1bcb2a547d9de SHA-1: 1661544a0820e3a7a7256a128ec822731ca07d45 SHA-256: 9830b4f7594bedc76ee9f77f0b01cb581b3e8a083a82b786381aff2351c73aee
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/strik?utm_term=download+the+escapist PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388274/normal_5f922f6c8f000.pdfIn PDF document text
    • https://gatofofuxiwiv.weebly.com/uploads/1/3/4/2/134265530/7440868.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383137/normal_5fabe34d73574.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373753/normal_5f8feda58292c.pdfIn PDF document text
    • https://razesupimo.weebly.com/uploads/1/3/2/8/132815812/kaxobaferusatejez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454824/normal_5fa6197c4e108.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425237/normal_5fa83ac372482.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392647/normal_5f8f9379483f5.pdfIn PDF document text
    • https://lubozukutiximik.weebly.com/uploads/1/3/4/4/134472848/genebuduvifokegor.pdfIn PDF document text
    • https://xesapidad.weebly.com/uploads/1/3/4/3/134346602/5bbbbf33b3314b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379610/normal_5f8bceea7f09e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387924/normal_5f9d3ebe02855.pdfIn PDF document text
    • https://mapipuluzobeb.weebly.com/uploads/1/3/1/3/131398440/6823183.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wilugugo/31222773645.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_off0000ca8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8B 5156 bytes
SHA-256: 08f37f7e1eb19d8a829c4c6adcdc659a4814519d305bf1f9aac80e0c0ca01660
font_01_sfnt_off0000dc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC32 10140 bytes
SHA-256: ef421b5fb15523f7af13e33b9cc772e8a22cd973dd08e433a6b48d0b970be8bb

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