Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdaea020e0a5eecd…

MALICIOUS

PDF

81.1 KB Created: 2021-03-14 21:53:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4eeba57736bb0a52c8140575fa8cc7b SHA-1: dd1f3cd8957935ae0b6e700326124d1d9ec5a354 SHA-256: fdaea020e0a5eecd5ade0cac4cbc1c927cc4fc39d865974d849c6c785f691e99
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 pointing to PDF files, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful 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://golowaki.ru/wix?keyword=bud+powell+hallucinations
    • https://cdn-cms.f-static.net/uploads/4380682/normal_5fdc848f62eed.pdf
    • https://cdn.sqhk.co/jimavidozeze/1Nidx2Y/66488205087.pdf
    • https://cdn.sqhk.co/jafetegupam/gfnjghc/jibedipirofosoxitazev.pdf
    • https://cdn.sqhk.co/fasixazijaz/jeuetRD/virus_killer_app_for_iphone.pdf
    • https://static.s123-cdn-static.com/uploads/4468823/normal_5ffff3a74a0b1.pdf
    • http://xopidufixa.iblogger.org/carestream_dicom_viewer.pdf
    • https://cdn.sqhk.co/kurafuso/dNwOgjW/6189019247.pdf
    • https://cdn.sqhk.co/turogepufe/aCsibgh/xbox_series_x_ship_date_amazon.pdf
    • https://cdn.sqhk.co/sevimifogu/RDSgfii/48870548387.pdf
    • https://cdn-cms.f-static.net/uploads/4425772/normal_601f931326750.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tolivajupeku/greek_gods_worksheets_6th_grade.pdf
    • http://lobakixadob.epizy.com/arcore_file_formats.pdf
    • https://s3.amazonaws.com/xeroguru/wowugaxakolukemesasavix.pdf
    • https://s3.amazonaws.com/wulagisi/fidoxumotuwagajapu.pdf
    • https://s3.amazonaws.com/nabifovu/nonufefowof.pdf
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_e89c828d4bd24a5d8acc60fae021a112.pdf?index=true
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_13991277eefd49f49dc0548d2710f29d.pdf?index=true
    • https://s3.amazonaws.com/sedowedi/acknowledgement_internship_report.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdf3.bin
5e7a182090fceaf544b69bd7d3099ed282ee8e33b737cc15b101de9859755730		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF3 5208 bytes
font_01_sfnt_off00010fbc.bin
2d8f08923bfeb3d73555a6fe66832c975c622459d74d219239f35070b0c99517		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBC 11184 bytes

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