Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ab93cb767cda250…

MALICIOUS

PDF

71.6 KB Created: 2020-11-20 04:03:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18238682c64db279b347f9f8b3f54533 SHA-1: 102379b0095ac3dc1ae61936fce6e495c9f43e4f SHA-256: 5ab93cb767cda250a940bd1ba9a40dcd5dae5d53efb8d4ab8b6272c5435ebc8c
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 of which point to a URL that appears to be part of a link farm designed for SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffnew.ru/strik?utm_term=encyclopedia+of+celtic+mythology+and+folklore
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/8450284.pdf
    • https://zozijopese.weebly.com/uploads/1/3/3/9/133997316/3730635.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/894cfa1b-5c1c-4c86-b7c0-6de6dfb0dc6a/terraria_large_world.pdf
    • https://uploads.strikinglycdn.com/files/391e0051-10da-42c5-9c2a-5fb5430b26ff/fartyg_fr_flottfrvaltning.pdf
    • https://uploads.strikinglycdn.com/files/863ea6cc-3d4f-4df6-bd05-fd969bd9f58d/rawopekixunifamepebuzijix.pdf
    • https://uploads.strikinglycdn.com/files/8516ca1f-a73c-445b-97c0-c494769384bf/scarred_witch_doctor_orc.pdf
    • https://uploads.strikinglycdn.com/files/aa9254e8-ba91-45c7-8fde-54bec53d7cdf/pacific_rim_novelization.pdf
    • https://uploads.strikinglycdn.com/files/73c7188d-9d3c-4797-9a3e-7c048ba9f91a/super_mario_odyssey_bonus_traveler27s_guide.pdf
    • https://s3.amazonaws.com/jajoxulabojaso/namerusekivorunatezovati.pdf
    • https://uploads.strikinglycdn.com/files/852064ea-85be-426e-9f58-bd9a1c77cb5b/82748643996.pdf
    • https://uploads.strikinglycdn.com/files/cd156836-a8c4-4e35-8ae2-5b8447cfabc6/junebetotunanedi.pdf
    • https://s3.amazonaws.com/gowebabuxogiro/attestation_de_domicile_mairie.pdf
    • https://uploads.strikinglycdn.com/files/0717546c-e0a5-4450-aada-96213248fe7d/solubonufopazitijod.pdf
    • https://uploads.strikinglycdn.com/files/f7bbfeec-491e-4803-b9d0-8b198e6c6c6e/descargar_pelicula_la_cenicienta_dis.pdf
    • https://uploads.strikinglycdn.com/files/d0da9a29-6ece-4b37-85bd-7b53c70f6c60/94973207103.pdf
    • https://uploads.strikinglycdn.com/files/b7d8945e-97f9-4809-b670-b1987777226f/wokove.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf3e.bin
bd6c188e8cf01447c58f4ee81db170f5d9f360341ccd7fa5e484337a17381e58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3E 5516 bytes
font_01_sfnt_off0000d1eb.bin
67aa7be64c90a066ce42e97d7ae11d78a1d680519ee171a78d167e31076b70b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EB 10876 bytes
font_02_sfnt_off0000f5f1.bin
6a781a10c85a2dd5fe9d6aba897d0ea36d2abe0934d237f75a0d76334a7217d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F1 17712 bytes

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