Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a7b6aeb6a4acfd4…

MALICIOUS

PDF

74.7 KB Created: 2021-01-25 21:32:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 756e71a0577266a2e9741a5f63a2db14 SHA-1: 71e7fb1a55e343bdc088707d6047fa8423fb1979 SHA-256: 8a7b6aeb6a4acfd4cd244b4a2cd20e328299ba8860e7ba54432c67afb8ec6d94
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is classified as malicious by ML and ClamAV, and heuristics indicate it uses a browser extension installation lure. The embedded URL points to a suspicious domain, likely serving a malicious payload or phishing page. While no scripts were explicitly extracted, the PDF structure and lure suggest an attempt to trick the user into executing further malicious code or visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://jottigo.ru/aws?utm_term=anime+go+apk+for+pc PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4457861/normal_5fd088e7f2be7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424996/normal_600ede73cc582.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483349/normal_5ff4a1aa9ff5b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455396/normal_6001090fca3ea.pdfIn PDF document text
    • http://pujuburebofig.iblogger.org/pitch_black_wallpaper.pdfIn PDF document text
    • https://cdn.sqhk.co/felodunom/c3jjXok/1689229239.pdfIn PDF document text
    • http://alcozerox.com/mijopowatatabalarcehw.pdfIn PDF document text
    • http://iceteas.space/best_music_equalizer_software_for_windows_7ls2ze.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/ydhfLFN/rikepodirinodidim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370286/normal_5fcb390d0a9c4.pdfIn PDF document text
    • https://cdn.sqhk.co/lixejudazeza/gjdgdZo/82619200873.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/rebomedug/92219021874.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_off0000e73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73F 5180 bytes
SHA-256: 7b0d1681200b21a9ab7de9579e3a1d60021487ba30cd89747852e438da993eac
font_01_sfnt_off0000f8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D6 11120 bytes
SHA-256: 81de4326ecd0e071caec4cbccef4e7601680f022195a9c1353ee093fffe0018a

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