Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ffcb06203cee37b…

MALICIOUS

PDF

77.2 KB Created: 2021-02-10 20:38:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 17ed82aad50067edd8a25e330a3252f3 SHA-1: c921e1ba01bfcafea7d8e3b73a4914930ab6fb03 SHA-256: 3ffcb06203cee37bf394a840d0ec064cb3ddce7f6006648a089165f36a014750
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of a 'Clipboard command execution lure' heuristic suggests the document instructs users to interact with the command line, likely to download and execute a secondary payload. The embedded URL https://baarspo.ru/aws?utm_term=bass+boosted++free is a primary indicator of a potential command and control server or download source.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://baarspo.ru/aws?utm_term=bass+boosted++free PDF link annotation
    • https://cdn.sqhk.co/duzoxibuf/7uqDjbR/jumebufad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412173/normal_5fc57e72495da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407306/normal_5fc602285e069.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/hxqQlxB/zapabifupuvuwigodexo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489733/normal_5fe003a6932f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366036/normal_5fdde9c377da1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447915/normal_6015c4875ee9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470692/normal_60001f9a2a0de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453720/normal_5feed2237ba03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486743/normal_5ff28c6f36983.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391315/normal_5fff0f60bdbe0.pdfIn PDF document text
    • https://cdn.sqhk.co/viforoge/bha7Ogh/werewolf_game_app_apk_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486965/normal_5fe1353c0e48f.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/iiantkI/sevetuze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sarososibi.rf.gd/wutodapajuvekopik.pdfIn PDF document text
    • http://poruroj.epizy.com/aeromagnetic_data_interpretation.pdfIn PDF document text
    • http://zekovulelopur.epizy.com/substitution_method_worksheet_math_aids.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_off0000f24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24C 5060 bytes
SHA-256: 19bb782c94d7170caf76fd6bf2e9a07d1156cbc8496e8b7a53a4ac8acffe5530
font_01_sfnt_off0001038a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038A 10584 bytes
SHA-256: fc51f6dfbd6c20086b2c9a8f9df81bbf8f45190d3c9047e08449bb33173b081e

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