Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ce8541ef4751a2…

MALICIOUS

PDF

66.0 KB Created: 2020-11-10 06:43:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: bb306c80c5458b15c2f1ce784f81e65e SHA-1: 1ca7e6fc2f216e8f7c07b99f42065221265d6a3c SHA-256: c3ce8541ef4751a261934dee76d6abe07a827be2307d9945964dc555f391902f
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many of which point to PDF files hosted on various platforms, suggesting a link farm or redirection scheme. The primary URL, 'https://trafffi.ru/123?keyword=pokemon+tv+app+kindle', indicates a lure related to a popular media application, likely intended to deceive users into clicking through to a malicious site. No scripts were extracted, but the presence of numerous external links and the 'Pdf.Phishing.Trojan' ClamAV detection strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/123?keyword=pokemon+tv+app+kindle PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374699/normal_5f8d3e7d58610.pdfIn PDF document text
    • https://fezuxikazosulav.weebly.com/uploads/1/3/1/3/131398093/c00bc5df65e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378845/normal_5f8c810f9a3db.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/9031774.pdfIn PDF document text
    • https://jikuvagipotax.weebly.com/uploads/1/3/4/6/134647272/fdf032130.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447436/normal_5fa1e42974f96.pdfIn PDF document text
    • https://rewemekekebaz.weebly.com/uploads/1/3/1/4/131406535/9144969.pdfIn PDF document text
    • https://nadosivilir.weebly.com/uploads/1/3/4/3/134316305/b707b227e.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/zetare/14724674140.pdfIn PDF document text
    • https://s3.amazonaws.com/potevip/bcc_mail_manager_full_service.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4360bd38-bf88-4f95-a73b-47e978d37b5d/18651970270.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/central_cal_volleyball_club.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/11293224024.pdfIn PDF document text
    • https://s3.amazonaws.com/suzeduselu/multi_task_ladder_on_stairs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b01bc407-ea4c-4154-9ef1-ea99af05840c/bulim.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/rhombi_and_squares_worksheet.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_off0000c33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC33E 4956 bytes
SHA-256: d66fed540aaf3d09f987aee4199d93ae83716d8a871ea956f7ea324e3135dc0b
font_01_sfnt_off0000d418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD418 11612 bytes
SHA-256: 7b65c268957bfa82c4c08dd35e83712129bdc87bc129ddd6e9b5615f3a573c54

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