Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3fff8d52a41ebc…

MALICIOUS

PDF

78.8 KB Created: 2021-03-14 14:11:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0904f534df6e6cd202ba74c23cf8006d SHA-1: 283536e3d6ad9ec21c5dda4ccc7532ca9a7522a2 SHA-256: 5f3fff8d52a41ebcadbd169ea068d449199d3cdcfaa448136e6296a87fc44523
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL disguised as a search result for educational content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of an external URI and the overall classification suggest the document's purpose is to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://bologen.ru/wix?keyword=projectile+motion+problems+worksheet+with+solutions+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407102/normal_60294716c89a3.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/hiVgfii/68959264529.pdfIn PDF document text
    • https://cdn.sqhk.co/novujarogoga/hjjEjeW/24232375869.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449405/normal_5fe0f0f91b8c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375356/normal_60043476f2209.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/hhjgPhd/international_special_days_in_november_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378853/normal_6036778b7e09a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467912/normal_604242f790240.pdfIn PDF document text
    • https://cdn.sqhk.co/rurufimibiwe/jji7Sgc/ted_talks_podcast_app.pdfIn PDF document text
    • https://cdn.sqhk.co/jogowijalaro/iaid0TB/zara_us_sale_dates_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485576/normal_602475767c421.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493597/normal_5fdc05144ef82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467298/normal_60409f53db03e.pdfIn PDF document text
    • https://cdn.sqhk.co/vefemenivu/xNJ1pha/crowdstrike_falcon_sensor_service.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/hbRgdjf/13047018370.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/winumigutam/77147162185.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/voxat.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/field_visit_report_template_doc.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/6440420240.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_off0000e8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F2 5440 bytes
SHA-256: 143acc8ecc282f6c6a3cd997b8e35b3603d8462455148de0d0d58e300aade375
font_01_sfnt_off0000fb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB47 10564 bytes
SHA-256: 9416974cbc2d79e4f6ba2a1153a49b6bca3ace7cc5c74403783cf9629f963404
font_02_sfnt_off00011f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F43 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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