Malicious PDF — malware analysis report

Static analysis result for SHA-256 680b5222e4ba4683…

MALICIOUS

PDF

72.3 KB Created: 2021-02-16 06:49:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 6210f21ef58550feae6fe031e0c25555 SHA-1: 65609f1ab846696ce5853fb7c2699e8dcb64138d SHA-256: 680b5222e4ba4683f2b7c26b23e8b6df5579620475db35ee2d562c0d72a046be
96 Risk Score

Malware Insights

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

The file is a PDF document flagged as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to a suspicious domain, 'jacksth.ru', which is likely used for phishing or to host a secondary payload. The document body is heavily obfuscated, but the presence of the external URI suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=vita+spa+hot+tub+jets PDF link annotation
    • https://cdn.sqhk.co/nanubebebot/Sif5ibU/need_for_speed_no_limits_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469640/normal_601b6cead5615.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446015/normal_5fce8b7a8aa7f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386074/normal_600900b9b4a92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445341/normal_5ff63822a8d23.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386074/normal_6008fed345900.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459654/normal_5fd06e20cd710.pdfIn PDF document text
    • https://cdn.sqhk.co/manoxixo/4xhahcu/15140127684.pdfIn PDF document text
    • https://cdn.sqhk.co/lediname/HUPjfhi/97145899941.pdfIn PDF document text
    • https://cdn.sqhk.co/loxepafigav/ehbjaGt/raxizoru.pdfIn PDF document text
    • https://cdn.sqhk.co/gimiraxu/wO2Thij/stock_car_racing_magazine_1970.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vavabi/pugireki.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/kemiwem.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/android_studio_gradle_disable_proxy.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/71749611169.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/81913790069.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/zaxanakezudidi.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/idle_balls_hack_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/rexuwil.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/lexicon_app_for_android.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDC 4960 bytes
SHA-256: 11ffecb774b52051a785498a65ea5a61376febbe95b70e057f01349670b9c152
font_01_sfnt_off0000efbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBE 10764 bytes
SHA-256: 4e6604bbd0c2071be5ad2a614adfd4e430dfa940fd4f1a60823b455da9dcbdf3

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