Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb8e1ac201ff9e19…

MALICIOUS

PDF

79.9 KB Created: 2021-06-14 12:38:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61d07b597d6f4f70294ab2f3131b272e SHA-1: 5103cda051b9f8fb49a48fd76bc65342481375be SHA-256: bb8e1ac201ff9e19b54f33facaa3966937d10809990a81e3d0bec42d3b32bb3b
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that directs users to a site offering movie streaming, which is a common lure for phishing attacks. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically to appear as a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://archism.ru/pbw?utm_term=little+man+streaming+full+movie
    • https://static.s123-cdn-static.com/uploads/4403816/normal_5fca53c4ebf13.pdf
    • https://static.s123-cdn-static.com/uploads/4383471/normal_5fe53db0bf5fe.pdf
    • https://cdn-cms.f-static.net/uploads/4367313/normal_5fdbc27a2c193.pdf
    • https://cdn-cms.f-static.net/uploads/4464327/normal_60640eaec1675.pdf
    • https://cdn-cms.f-static.net/uploads/4467561/normal_60be3c83870ee.pdf
    • https://cdn-cms.f-static.net/uploads/4464720/normal_60667dfb67c2c.pdf
    • https://cdn-cms.f-static.net/uploads/4368503/normal_6054524cc444b.pdf
    • https://cdn-cms.f-static.net/uploads/4466413/normal_600f57ebda240.pdf
    • https://cdn-cms.f-static.net/uploads/4371004/normal_5fd368dd62d9d.pdf
    • https://static.s123-cdn-static.com/uploads/4497697/normal_5fe2f53942322.pdf
    • https://cdn-cms.f-static.net/uploads/4482854/normal_60c5d5a9a0069.pdf
    • https://cdn-cms.f-static.net/uploads/4495251/normal_604b1ae0438fc.pdf
    • https://cdn-cms.f-static.net/uploads/4444850/normal_60175d069f893.pdf
    • https://cdn-cms.f-static.net/uploads/4426556/normal_603a5a4273c36.pdf
    • https://cdn-cms.f-static.net/uploads/4456114/normal_6048e96dbef6d.pdf
    • https://static.s123-cdn-static.com/uploads/4498842/normal_5ffe1db1dd017.pdf
    • https://cdn-cms.f-static.net/uploads/4403120/normal_5fda1f827e6da.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2248dcd9-7b39-4337-8f7c-b54f4defec17/the_adventures_of_huckleberry_finn_download.pdf
    • https://uploads.strikinglycdn.com/files/a058e09f-5342-46d9-8a60-4d2fcdaf171b/tefigozo.pdf
    • http://ravowibosu.pbworks.com/w/file/fetch/144480933/13860681531.pdf
    • http://gazoridixilu.pbworks.com/w/file/fetch/145137666/13952457056.pdf
    • http://vixasoli.pbworks.com/f/hannstar_j_mv_4_94v_0_e89382_bios.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_off0000fb42.bin
8e5189e9f780e2df9940ed4bed734f9e7833623e1529402c7b3bdacf103766e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB42 5088 bytes
font_01_sfnt_off00010c84.bin
b913d74b24270fd34e0533e9abd80bba3481b21d20316e0f62d603290e3f1261		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C84 10872 bytes

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