Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace16f604258a96b…

MALICIOUS

PDF

77.5 KB Created: 2021-02-23 07:50:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d18066369b73decfab882dc2d8ce65f6 SHA-1: 72024de5cd5c3e3b107bde32d5113450afdcf30d SHA-256: ace16f604258a96b265b819a5a88fa4f9252cd95cb71b294f64dc5ba89fcaf68
136 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it uses a social engineering lure to trick users into installing a browser extension or update, a common method for malware delivery. The embedded URL likely serves as a download or redirection point for the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=calories+in+taco+bell+box+meal PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387808/normal_6006886f9dfe8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455658/normal_601e3ffa8c269.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379048/normal_601c989360ddc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407084/normal_601043ec7c3ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415331/normal_5fe04e3f386bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493920/normal_600a20ec7a5e0.pdfIn PDF document text
    • http://fudasoba.iblogger.org/pilalenavexofugujamus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://mafofeguf.epizy.com/56148588020.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/kaeng_krachan_national_park_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/hydraulic_oil_68_data_sheet.pdfIn PDF document text
    • http://gadunekubajip.rf.gd/vozevivasedefuxibujorovid.pdfIn PDF document text
    • http://wugejevesi.rf.gd/99087616055.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/modukuwomitatesutexub.pdfIn PDF document text
    • http://wegexaluda.epizy.com/berkley_platform_wedge_michael_kors.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/wenedoto.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/25378619451.pdfIn PDF document text
    • http://gagonunanu.epizy.com/platform_ticket_online_app.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C4 4964 bytes
SHA-256: d4f7b1525f918ac6918c86ff6deca52e90a215553c9a5b8b179e550c628cab23
font_01_sfnt_off0000f48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48A 11324 bytes
SHA-256: 3e3ea5c3c157516dbcb25c2cb2dafc61de0b7a334bc304d2b883fa004f8b94dd
font_02_sfnt_off00011b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B06 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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