Malicious PDF — malware analysis report

Static analysis result for SHA-256 623b7629363c700f…

MALICIOUS

PDF

70.9 KB Created: 2020-12-27 16:04:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: cf5053574bc7ed46eea54f6e29ca7305 SHA-1: 164e1b649162dff253568dc452b2a64ffe27c396 SHA-256: 623b7629363c700fb420ddb8c4317816c8c7094150a8f2a11a70df261a240b30
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains a lure related to Gmail sign-in issues on iPhones, directing users to a suspicious URL. Heuristics indicate a browser installation lure and ClamAV detected it as a phishing trojan. The ML classifier also flagged it with high confidence, suggesting it's designed to trick users into downloading malicious content or providing credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://trafffe.ru/strik?utm_term=gmail+won%2527+t+sign+in+on+iphone PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417653/normal_5fafef44a65c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417653/normal_5fd3c9a7da626.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383913/normal_5fa02c545b5df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426810/normal_5f9ba376a9b34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383131/normal_5fa55c6e8617f.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/tinajabizoreguf/cpm_ebooks_course_3_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/gikomaxotiborutoneve.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/battle._net_slow_speed_fix.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/kanujubi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24220096-bdcf-4c05-8de0-255e51631630/zosebamotakebuvab.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/twist_of_fate_sad_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d42176fa-2e08-4fdd-8d5c-59f5a442a930/epic_seven_characters_ranking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a51acf3c-0a18-4b55-b428-95cbb6681146/43699891106.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_off0000d86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86A 5292 bytes
SHA-256: 9860fff66ae0611c37bbf51ea91841f75033b9ce08ab71e9e429543697cd4143
font_01_sfnt_off0000ea5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5F 10748 bytes
SHA-256: 81345de0bde73038c8ee260a378210fbe81e062b37c6576bae6676df3b2dd211

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