Malicious PDF — malware analysis report

Static analysis result for SHA-256 39cfe97d171727ca…

MALICIOUS

PDF

72.4 KB Created: 2020-12-24 05:33:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 6f7ee2833df6d12f3d47d0cdccd2b220 SHA-1: d8519e4d01ff3a14b44b55afbb7851ab9b79a514 SHA-256: 39cfe97d171727cac6b0eacc41a5248523ae4216e21e1728eb405eb5b2c0f9e8
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. The presence of an external URI pointing to 'trafftec.ru' suggests an attempt to redirect the user to a malicious site. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious workflow, likely involving a download lure.

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
  • 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=best+popular+ringtones+2019+download+mp3+bestwap PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402247/normal_5fbcd079b4e8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384632/normal_5fe3c2a15e3bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379603/normal_5fe3e462e50c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403118/normal_5fa703c843b7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421199/normal_5f9794e04d307.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416669/normal_5fbb52a0416c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421336/normal_5fe30b84af807.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464315/normal_5fa8ce28240d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466376/normal_5fdcb10225c13.pdfIn PDF document text
    • https://cdn.sqhk.co/zijikunu/whgjifq/asteroid_warning_2020_september.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/bivanud/63358043622.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/39956381722.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/av_to_vga_converter_circuit_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/best_android_phone_photo_recovery_software.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/kalejogovizezika.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/rububakiditeninuzekolak.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_off0000cf22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF22 6204 bytes
SHA-256: 264a41ea6dce2c0ef95d8d22c7625d193d7dac5fb3e7572ad46cff2dbe2b33d2
font_01_sfnt_off0000e42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42D 2140 bytes
SHA-256: 3eadf3ff1ae85f7a2dd8be852d633ca148c1d24200a16cbd4325889adc5789c4
font_02_sfnt_off0000ee07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE07 10912 bytes
SHA-256: e30316d07dca4ac6aaf870d052ad8f9c4637b977da6367bf64a2a9d13de126f7

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