Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee03763817d188cb…

MALICIOUS

PDF

72.6 KB Created: 2020-11-19 04:01:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0b12fc6763773bddf480346d42335afa SHA-1: d8381f05e0f3c3c7cd68e486bc0d92445812e3d7 SHA-256: ee03763817d188cbe7a9e22dc2173a309e4d43bc6606712488a6fbd00cb006fd
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 5

  • 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.
  • 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://trafficel.ru/strik?utm_term=problemas+sistemas+de+ecuaciones+2+eso PDF link annotation
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/5689976.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446770/normal_5f9f7903a90fe.pdfIn PDF document text
    • https://giginepa.weebly.com/uploads/1/3/4/3/134389182/dosogirelodaga-gatad-gezutudabogadi-gubogorizuboliw.pdfIn PDF document text
    • https://linepofikoleku.weebly.com/uploads/1/3/4/4/134492010/5052252.pdfIn PDF document text
    • https://nabidojanafo.weebly.com/uploads/1/3/4/4/134455463/kurira.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427809/normal_5f9a24bb23ec1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464301/normal_5fb4442ed2641.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381541/normal_5f96bcacb6fed.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/4828e998-9aa1-46d6-b476-42363594066d/rise_of_flight_the_first_great_air_war_steam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efe2877c-5adc-46bd-bb01-006a6fee00da/wuzoxuguwizawegovunagalo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d8e3c5e-c56c-43dc-806d-f1fd602bf50e/53490394541.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10ff11e3-84e3-477c-ac76-2f2fda0d80cf/wizamevedizoxozafulej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01f34445-109b-4ae5-b842-8ef73bd55008/charles_wheelan_introduction_to_publ.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_off0000ce11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE11 3304 bytes
SHA-256: d7d013408685d1bf1dc1dee1d90893ea0daaa0e4e5db9584292ef4d00e01cff0
font_01_sfnt_off0000d9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F5 5356 bytes
SHA-256: c695199956db545857e6693cff7f1773c0b119ef1e66f2ec5e4da29ee413a077
font_02_sfnt_off0000ec06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC06 12072 bytes
SHA-256: b5720621e222c282b721b44ffeb9747ff3370ccdf69dc8381be870b993922642

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