Malicious PDF — malware analysis report

Static analysis result for SHA-256 a035830e0eaa8ec3…

MALICIOUS

PDF

75.2 KB Created: 2021-06-02 00:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8824f565e318d2e04ac8b78fbbe34698 SHA-1: 9e7496b83fdf0cbb9f6c1f95db569a1701df44fc SHA-256: a035830e0eaa8ec33969bff6d92a804d6bfbd47e1e7333b474bc5a86e03f4cd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, identified as a "link farm", designed to direct users to various websites. The document body, though heavily obfuscated, contains text suggesting a lure related to a "hacked version" of something, likely to entice clicks on the embedded malicious URLs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

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://irlanc.ru/pbw?utm_term=crush+crush+hacked+version
    • https://xipunozelizu.weebly.com/uploads/1/3/1/3/131382486/c5cf7ada.pdf
    • https://cdn-cms.f-static.net/uploads/4466659/normal_6036ce0ceafbd.pdf
    • https://renezotutumiw.weebly.com/uploads/1/3/5/3/135343322/tudisa_zarupavowomizuk_zurow_mapoduruvekuwew.pdf
    • https://cdn-cms.f-static.net/uploads/4504922/normal_5fd6370d21f5b.pdf
    • https://cdn-cms.f-static.net/uploads/4450428/normal_6035667bef0e8.pdf
    • https://static.s123-cdn-static.com/uploads/4463538/normal_5ff788ee5fdfa.pdf
    • https://cdn-cms.f-static.net/uploads/4490116/normal_601b42b1cc096.pdf
    • https://cdn-cms.f-static.net/uploads/4418755/normal_6054f74606155.pdf
    • https://cdn-cms.f-static.net/uploads/4469860/normal_5fdc4ea11c295.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a29acdd3-212a-4ff9-b9ac-bf90851464fd/74193905490.pdf
    • http://vajaxasave.pbworks.com/f/how_to_set_up_ravpower_filehub.pdf
    • http://bilabegape.pbworks.com/w/file/fetch/144480771/zewomivewozomodupesofe.pdf
    • http://dobifapig.pbworks.com/f/how_to_connect_airpods_pro_on_android.pdf
    • http://xuresasadox.pbworks.com/w/file/fetch/144456345/best_free_music_sequencer_app_android.pdf
    • http://poxanoralanu.pbworks.com/f/62992060879.pdf
    • http://nosiravuga.pbworks.com/f/descargar_mods_para_street_legal_racing_redline.pdf
    • https://uploads.strikinglycdn.com/files/4d078a6c-f2bb-414e-9b49-a2ef720af773/nuance_power_standard_1.2_download.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_off0000ebf5.bin
d85783500a15fead248e4cb730edd7e568a34de63b8e5e8a13196fa345363598		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF5 5024 bytes
font_01_sfnt_off0000fd02.bin
2e2daebb75c1e8d64c1886cac26283ba200d086f3a7440d0f812a8f1f085d64e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD02 10264 bytes

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