Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c4ab86d72dda3f…

MALICIOUS

PDF

69.6 KB Created: 2020-11-11 19:27:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a40428a95b9cad3f929da0fd70773678 SHA-1: 987ff67e560b600059e145d3db239ebdd8914c2f SHA-256: 19c4ab86d72dda3f2e41eebd5050eeaa5444313e179a8d24d3c71caf4af78fff
254 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 and routes users through malicious redirector infrastructure. 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
  • 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 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
  • 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/123?utm_term=ad+blocker+for+android+apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4448986/normal_5fabaca0361b5.pdfIn PDF document text
    • https://boxolajabamofi.weebly.com/uploads/1/3/4/3/134356625/wiwakatex_mebodunomel_mavim.pdfIn PDF document text
    • https://lolisusije.weebly.com/uploads/1/3/4/6/134627287/feb3f0caae38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426820/normal_5f9dd5803466f.pdfIn PDF document text
    • https://geguguxe.weebly.com/uploads/1/3/4/5/134513061/9588138.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/rimejiguvif/bretonnia_guide_total_war.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dc0cc3f-8eb7-4c33-96f7-4ca065236d1e/36903371462.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c75cfc36-e2bb-4cdf-b438-9981f086aa56/feral_druid_talents_wowhead.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/gidudarekipamif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/409c5b65-e55e-47a8-af0b-270d5e6f73f9/gojorusujutoparuvuwub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e10ed5bf-5143-47e9-b860-1f3330f2a8b9/sofoga.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/roblox_skyblock_value_list_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8f7faee-a5a8-4187-8767-24a2bb40deec/mosque_de_cordoue_histoire_des_arts.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_off0000d309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD309 5164 bytes
SHA-256: d5d04744577ba623cc4969907e33e436e00c77cb18ee3292a60713043099635d
font_01_sfnt_off0000e4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A5 10724 bytes
SHA-256: fe910cd2aa4164bdb812bfef2251ad04d9c00048d1023627e45d02095cd95166

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