Malicious PDF — malware analysis report

Static analysis result for SHA-256 63c84240cf41e726…

MALICIOUS

PDF

79.2 KB Created: 2021-03-24 08:36:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66ce9dc28b5b349994abd851de142aa3 SHA-1: 81cc4fd345ee492a027d6621060b0eb1df526bb9 SHA-256: 63c84240cf41e7269517f7c9e2081a35b2ccd03e96ccfe99408fe4c378309140
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, pointing to various websites. One of the primary external URIs identified is 'https://dafemum.ru/wix?keyword=yonke+de+carros+en+ingles'. ClamAV also detected the file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', suggesting a phishing or trojan distribution intent. No scripts were extracted, but the structure suggests a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dafemum.ru/wix?keyword=yonke+de+carros+en+ingles
    • https://metoxuxiduwano.weebly.com/uploads/1/3/1/6/131636764/5b32971.pdf
    • http://lumobumekola.getenjoyment.net/wu_tang_american_saga_season_1_episode_8_watch_online.pdf
    • https://cdn-cms.f-static.net/uploads/4446507/normal_5fd3a34faf1cf.pdf
    • https://cdn-cms.f-static.net/uploads/4388815/normal_5fd7906b64b33.pdf
    • https://static.s123-cdn-static.com/uploads/4369512/normal_5fe0711cc7ced.pdf
    • https://retotanenumu.weebly.com/uploads/1/3/4/0/134017544/nagoxesedut.pdf
    • https://pamigewome.weebly.com/uploads/1/3/4/6/134631685/7454075.pdf
    • https://mafetoga.weebly.com/uploads/1/3/0/8/130874134/gedafa.pdf
    • https://fosevikotik.weebly.com/uploads/1/3/1/6/131637163/3813080.pdf
    • https://pugiputofal.weebly.com/uploads/1/3/4/7/134740318/5326525.pdf
    • https://static.s123-cdn-static.com/uploads/4446280/normal_5fe3a5f61fd6f.pdf
    • https://latimemoniborij.weebly.com/uploads/1/3/1/4/131437487/4370627.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gogujigasad.onlinewebshop.net/motor_vehicle_bill_of_sale_template.pdf
    • https://uploads.strikinglycdn.com/files/170b9b81-cec9-444c-8b10-0bb06299250d/what_does_number_555.pdf
    • https://uploads.strikinglycdn.com/files/38a7bfb1-1e5f-4542-b2f3-9820bcfd35cc/garelelunafabobumeko.pdf
    • https://uploads.strikinglycdn.com/files/d883a737-9f87-45a7-aee5-0c9d64b27fbb/77826725443.pdf
    • https://uploads.strikinglycdn.com/files/eb71fa2f-8bbb-4cea-b57d-a70a90f36b6c/18994278798.pdf
    • https://uploads.strikinglycdn.com/files/e70f93d3-3ce1-44ce-b473-dd571346a50b/86949594815.pdf
    • http://wuxosalilujaza.atwebpages.com/tinolelo.pdf
    • https://uploads.strikinglycdn.com/files/51a526d6-b7a4-41c4-b7d6-815f5f3157be/engineering_program_manager_interview_questions_apple.pdf
    • https://uploads.strikinglycdn.com/files/307a4e67-f3d0-4eaa-9618-39e32f320e11/56823236043.pdf
    • https://uploads.strikinglycdn.com/files/7f41a08e-cbc6-4bec-9d44-37906864c0b8/3126082572.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e650.bin
a28fcc4ba65d8171a55e8b87d646ac5d1dd213f66ab2b0026fd39e5ca5d32d1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE650 2900 bytes
font_01_sfnt_off0000f092.bin
b741599a151496eb831a9fc643c495b0db120c96a42fa50d6c7be4dd3e475e04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF092 5132 bytes
font_02_sfnt_off00010217.bin
849e3fe97f8601356ebc1349ae65688594121d0a635fd26fffe8272fbf8ea35a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10217 14096 bytes

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