Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3660fe81495d0d2…

MALICIOUS

PDF

58.9 KB Created: 2020-11-26 01:06:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b3f361c8bc94e034daf198e20b996851 SHA-1: d142b0ab4725ec9bca49cadce1a95d8953db5ce9 SHA-256: f3660fe81495d0d275cbd9a441995af8086df2eff20f716af1ae35c8788b1b38
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, indicative of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://traffset.ru/strik?utm_term=dover+high+nh+hockey PDF link annotation
    • https://vebunigujop.weebly.com/uploads/1/3/4/3/134367951/79a9c424c4e.pdfIn PDF document text
    • https://sekatuxu.weebly.com/uploads/1/3/4/8/134894727/duxeje.pdfIn PDF document text
    • https://lezunodukulo.weebly.com/uploads/1/3/4/3/134341823/gomini_zolonamotikuso_napubil.pdfIn PDF document text
    • https://wetolobumusu.weebly.com/uploads/1/3/4/5/134579125/sodutuwap.pdfIn PDF document text
    • https://ketibavobatuver.weebly.com/uploads/1/3/4/8/134849788/ninuripuxivibe_dopob_gefev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405903/normal_5fb92f56e6e8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422180/normal_5fada9967e1ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388183/normal_5f91b4d3dbd09.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/b6947ef6-8f30-4b95-bffc-1a957a79d02a/kedoguwexav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30e17df6-6fa2-4664-a069-6fe8370e23fe/zatowiduxafud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bd4f602-33ec-4ea0-b8a3-097eb783deb2/99954274200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4286b011-6434-4068-8915-e5b30fb4cee1/rujaxedagizonowonimoboro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fe958a1-697a-4624-8a39-5e1e4b4bb85f/rimworld_ice_sheet_challenge.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_off0000ab39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB39 4864 bytes
SHA-256: 5bd7c9a901dc607f350718655fc3a04644b32673a3edd38090ecf452be011bc2
font_01_sfnt_off0000bbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE1 10568 bytes
SHA-256: c4323c7519ac2422dff275ec8d94314a210ba3713e37cbab7b87996e68250841

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