Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e6c6d538380cce5…

MALICIOUS

PDF

70.1 KB Created: 2020-12-19 23:08:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7944bfb0abd3bb87a97a805c29eabc38 SHA-1: 9dbbe7c7afd8cf9655bca0f65b3cd70cd6f6f550 SHA-256: 2e6c6d538380cce54393ee504192d0ec1e447196dc3b6dcc8d6d6491bbfcf3bb
156 Risk Score

Malware Insights

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

The PDF file contains a mass of external links, identified as a link farm, with one prominent URL pointing to a potentially malicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/123?utm_term=uniqlo+size+guide+womens PDF link annotation
    • https://mofalapew.weebly.com/uploads/1/3/4/3/134307760/wozitawaxu-buvir-mewux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426263/normal_5fc183188a61b.pdfIn PDF document text
    • https://vepiduworubul.weebly.com/uploads/1/3/4/7/134723348/zugiwidopowak-wuwofumorumik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484154/normal_5fcd5fa11a8f2.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/22867edc-6b23-4130-b421-ab0f3ad7a9fe/libros_de_kinesiologia.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/playground_apk_for_poco_f1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23430390-5bc3-4890-a36c-bf24e1bbcedb/zotowi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf51e49ee0f32b874a5ec5/1606373860435/69874159168.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/68895130853.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faa667b2-c362-4f04-a6db-d7ed43a2c0fd/fewoxoxakowe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e9a5c48-57fc-4fd8-8282-89455703290c/soxonikodokigewagimofedak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b7585cb-5238-4b88-95a8-5a26f33fed88/44759858804.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cd416ad-2434-4245-97b6-affa22277db3/tokixazanozokibedutigemos.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_off0000d511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD511 5100 bytes
SHA-256: fb75d20621298303acfb8cef7ff2c840f2134dd3d258dd422f7e77da225890fd
font_01_sfnt_off0000e671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE671 11216 bytes
SHA-256: bdfceecb74a0be0647610a8e96a6286d4384dff2302ae0d251c2c90a1d9dd670

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