Malicious PDF — malware analysis report

Static analysis result for SHA-256 f87ef556fa5248c7…

MALICIOUS

PDF

68.3 KB Created: 2020-12-20 15:49:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 106bfb76a17ea61a8730956d272aa730 SHA-1: dfb173fad54eb2eaf38621750a8f3f0db0d9094c SHA-256: f87ef556fa5248c7c06a880ea7e7f545641f04a2f0a4594f8c250677d997043b
144 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 social engineering by presenting a download button and a lure to install a browser update, common tactics for malware delivery. The embedded URL likely leads to the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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
  • 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
  • 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://trafftec.ru/strik?utm_term=back+to+eden+pdf+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374708/normal_5fcbd2988798c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375690/normal_5fa2e77aa4237.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
    • https://s3.amazonaws.com/dazemi/jisewuvamudogilewep.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/carrier_aircon_instruction_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/zemukusagelemozepegupeve.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/risapapovapuluki.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0fbb61c8c741314323605/t/5fc9ff80e262c01594673061/1607073665267/roseven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c51e7045-95da-4f4f-9716-37d4bd87e60c/comma_splices_worksheet_3_16_exercises.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_off0000c434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC434 4820 bytes
SHA-256: 355e52e5073ef833bc715a567ec0d55fb736bc3532f20b9151431ce3cce65a97
font_01_sfnt_off0000d4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B7 9860 bytes
SHA-256: 8964312b954c9877f14ad374e9bb6db6e85a8d25831c13f76ed0b2d9a8f43d7c
font_02_sfnt_off0000f67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67A 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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