Malicious PDF — malware analysis report

Static analysis result for SHA-256 e20476c926a6b61c…

MALICIOUS

PDF

74.2 KB Created: 2021-03-14 13:34:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aafd2fe040e20724ae4b7179ee2d82ad SHA-1: f010a00aee989996f225fbaf88a4538187d3a2e6 SHA-256: e20476c926a6b61cb3d67b11dfc119edb7de97301ff2ab8d633e2a7520cdb1e6
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 of which are likely part of a link farm designed to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The embedded URLs suggest an attempt to redirect users to potentially harmful sites, possibly for phishing or to download further payloads.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/strik?utm_term=jon+duckett+html+and+css+review
    • https://cdn-cms.f-static.net/uploads/4486742/normal_5fd33ef7159da.pdf
    • https://cdn.sqhk.co/jujifefa/0x4zogh/15389581092.pdf
    • https://cdn.sqhk.co/ruvuwoki/fhj5haz/woxuxunum.pdf
    • http://talezoruvaje.iblogger.org/83696676204.pdf
    • https://cdn-cms.f-static.net/uploads/4447464/normal_6010755aea4b2.pdf
    • https://cdn-cms.f-static.net/uploads/4494889/normal_604316c98e971.pdf
    • https://cdn-cms.f-static.net/uploads/4473064/normal_604948534ff3c.pdf
    • https://static.s123-cdn-static.com/uploads/4373755/normal_5fcaec7138cc6.pdf
    • http://zupaxowo.22web.org/3d_photo_android_app.pdf
    • https://cdn-cms.f-static.net/uploads/4465259/normal_60391c4827873.pdf
    • https://static.s123-cdn-static.com/uploads/4366622/normal_5ff7fa90134ff.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xafofeb.epizy.com/zeotropic_app_pro_apk_free.pdf
    • http://fituxulilofe.epizy.com/aluminum_clad_sheet_2024_o.pdf
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_76f1f45b9a95404ab91115fb754da2d4.pdf?index=true
    • https://30cc9e9c-6145-4029-bfdc-d0561bdb3a10.filesusr.com/ugd/0dcf4b_c054297010944514997d630fc4fbe1f3.pdf?index=true
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_a94af73616494cf78124c2267321f30d.pdf?index=true
    • http://lusiwavi.rf.gd/scottish_heinemann_maths_worksheets.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_off0000e3f2.bin
2b5c09423746a89ba3a161df2c0cec61c8699930889ca0e3fa95f475f5259edd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F2 5384 bytes
font_01_sfnt_off0000f626.bin
d18f6df5d36547dd381d10164733182e4e3ea129d52b2b6eacac285d51fd24bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF626 10940 bytes

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