Malicious PDF — malware analysis report

Static analysis result for SHA-256 afe84735f4e8e515…

MALICIOUS

PDF

69.4 KB Created: 2020-11-13 05:44:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: edd64e21f620999a5d67ba8fd63baf16 SHA-1: 966b6744e6c7d59f9c93df3edd4edb639f661af2 SHA-256: afe84735f4e8e51554c1b3e629362484e44f7bec3de7f469ccf88ab5a7450d06
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 0.9969

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.
  • 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://trafffi.ru/aws?utm_term=video+er+for+instagram+apk+uptodown PDF link annotation
    • https://sepanafawo.weebly.com/uploads/1/3/4/3/134316973/pobevajonavawe.pdfIn PDF document text
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/5493933.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/satedafadusizo/jalowepowarovidilutita.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/30259142624.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2ad259b-2d2f-433c-8128-357a520b0d4e/womowaxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe00d090-8306-40c5-9604-2844d689f1fb/sunox.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/vivaverapazokogilevoze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5af7f119-311c-48b1-aa3e-0b9d811317ff/gebuxoxonomuve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed1bc6b9-9a18-4dd9-8cef-2efc25a3c09f/28126213048.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_off0000c66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66B 5452 bytes
SHA-256: bcb8e32247e6e93b3e95416762a1cf15ec67f5392ee360065d6c2cfcc5e7d4c6
font_01_sfnt_off0000d8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F2 2672 bytes
SHA-256: 61c3d7277fc2b7d147597656dac7abd8029036164664dfa2e702365dd98a103f
font_02_sfnt_off0000e49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49B 10484 bytes
SHA-256: 85cf53af1f91ea170edaf42eb3e21709afe297758d65174f8047f3586e7d13ca

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