Malicious PDF — malware analysis report

Static analysis result for SHA-256 e988b50a4f9c54c5…

MALICIOUS

PDF

139.0 KB Created: 2020-12-19 12:39:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 8440b383012feb21c0c7ed831c8e9cf0 SHA-1: 7ac66313718d5ee3809937f0ddb90612ad2c5e4f SHA-256: e988b50a4f9c54c5a433c0aa39738ee4bc6cccd306b72046bf7f18d9ca6b6dbe
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, indicating a phishing and potential trojan threat. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. Crucially, it employs social engineering tactics by luring users to copy/paste clipboard content or reveal recovery secrets, strongly indicating a credential harvesting or private key theft attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://trafftec.ru/aws?utm_term=angular+6+radio+button+reactive+form PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446019/normal_5fcd6cdfb55cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466376/normal_5fa498e8cbec7.pdfIn PDF document text
    • https://maxubuzidam.weebly.com/uploads/1/3/4/4/134486229/7376325.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485450/normal_5fa7887fe7ea8.pdfIn PDF document text
    • https://diwuxofemuji.weebly.com/uploads/1/3/1/4/131407179/1218347.pdfIn PDF document text
    • https://wotigutaz.weebly.com/uploads/1/3/4/3/134361511/2469631.pdfIn PDF document text
    • https://noduxulab.weebly.com/uploads/1/3/4/9/134901810/dakosuvedupar.pdfIn PDF document text
    • https://bijoxopibomer.weebly.com/uploads/1/3/4/3/134325560/8715824.pdfIn PDF document text
    • https://naxizugopigonav.weebly.com/uploads/1/3/1/4/131408516/237b840c16fa.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/najipavez/increment_calculation_sheet_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/nazca_culture.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/sinusoidal_pulse_width_modulation_inverter.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/77273333949.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_off0001dfe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DFE9 5504 bytes
SHA-256: 72e0cc45315434c7566441925c2e11646c636cb1978aa469d17459fa5f1b1157
font_01_sfnt_off0001f29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F29F 13152 bytes
SHA-256: a5cd8e901b23e4c60a0b1ab13de9d732d1246ab127cc8861e3351bda657065ea

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