Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef7a98765e4b99e…

MALICIOUS

PDF

82.3 KB Created: 2021-03-03 23:39:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c1af85696f30167ce757e10d7e02100 SHA-1: 830187c1264a1caade08b1a9eaa5af31785c63d4 SHA-256: fef7a98765e4b99ec7c0e7eb16891fe5f4c4d47b69ed775d28350d60bd677aae
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URI pointing to 'https://kuzutuzo.ru/wix?keyword=assembly+line+mobile+game+guide', which is likely a phishing lure or a download site. The document body, though heavily obfuscated, suggests a theme related to a 'game guide', reinforcing the lure aspect. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly indicate a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://kuzutuzo.ru/wix?keyword=assembly+line+mobile+game+guide
    • http://dabuxupufudina.22web.org/sapipikikuneravexaf.pdf
    • http://nakozek.mypressonline.com/what_is_retail_services_specialist.pdf
    • https://cdn.sqhk.co/sowodopevew/hitjdIZ/cytosine_resonance_structures.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://kixixiwibatogit.epizy.com/wipijowudegifibi.pdf
    • https://s3.amazonaws.com/gewisetug/merge_excel_worksheets_into_one.pdf
    • https://s3.amazonaws.com/jiwisi/muvogidunomisa.pdf
    • http://tinuzutajalik.epizy.com/23605222429.pdf
    • https://s3.amazonaws.com/gapuruxumeg/promptly_form_a_sentence.pdf
    • https://s3.amazonaws.com/xomudufe/ruduwajinokuneniweludaf.pdf
    • https://s3.amazonaws.com/bulalowisu/66165124527.pdf
    • https://s3.amazonaws.com/xepululejiwof/21008703126.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_off0000fb5d.bin
653bf65dfc5f530031d22656e21ef58bef256ab588c92a9015001a625a9028e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5D 5084 bytes
font_01_sfnt_off00010c88.bin
ca6bfdb2817c6520eb2c41d170cf990294d79a97ca21f09d80c0eba02e6f2fad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C88 9948 bytes
font_02_sfnt_off00012e9e.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9E 4324 bytes

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