Malicious PDF — malware analysis report

Static analysis result for SHA-256 22b31b06425e94bc…

MALICIOUS

PDF

156.6 KB Created: 2021-01-26 11:20:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 037a3aae0c6ec60fc95041f8eb8d822b SHA-1: 449a83d8d4a8b11a390b64a57478031eeac14cf8 SHA-256: 22b31b06425e94bcb1949b3abc7d69fbbf63d36a20844b92c1657d314b5331a8
144 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document instructs the user to copy and paste content into a shell, a common tactic for executing malicious commands. The embedded URL 'https://traffset.ru/123?utm_term=is+college+worth+it+background+essay+questions' is likely part of this lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffset.ru/123?utm_term=is+college+worth+it+background+essay+questions PDF link annotation
    • http://tuvexiwegivuke.iblogger.org/wexexux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370068/normal_600c761db730a.pdfIn PDF document text
    • http://kaxidabifibag.iblogger.org/bendix_king_digital_radio_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393751/normal_600b447a9d1d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465136/normal_5ffd526a84117.pdfIn PDF document text
    • http://noksipals.online/post_it_notes_inventor_net_worthomi8e.pdfIn PDF document text
    • http://sunny-web.ru/podixalilasuxunny24c.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/zubata/cubase_5_full_software.pdfIn PDF document text
    • http://kefabebabefi.rf.gd/disqualification_report_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/gasuv.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/71672363797.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/75785433534.pdfIn PDF document text
    • http://lodavudomajip.epizy.com/human_development_report_2011.pdfIn PDF document text
    • http://nifekubipaxo.epizy.com/happy_birthday_coloring_sheets_to_print.pdfIn PDF document text
    • http://fikuputo.epizy.com/fixazubafepe.pdfIn PDF document text
    • http://pagosunizuboroz.epizy.com/sunibanasajigo.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/buxunujosufanufotexofib.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/46342078007.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000212f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x212F5 5660 bytes
SHA-256: 4300a4e2d4c0e6a5a82d62afce22afb5cda7b71819893dcfd83ce3a5e6f5c1f6
font_01_sfnt_off0002263a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2263A 11888 bytes
SHA-256: 1797b05d511058e7f20e743beca19eb70a8c6a4692562b09a938c38e3a902058
font_02_sfnt_off00024f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24F08 16112 bytes
SHA-256: 275d0ef8f619a30f75d5b67021c85ffe51dbf44d82a44ecb2d07128ff93f9399

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