Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f657db747ed01db…

MALICIOUS

PDF

103.2 KB Created: 2021-03-02 17:11:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 2324a98887a720e6fd6ce7ec5ba3c9c3 SHA-1: da14969a6e3cc8cef9373e3197f139754f1524c4 SHA-256: 3f657db747ed01db095a706ef87f5f2d46e2b2e7855a1b638b34dcefa9ac105a
104 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of external URIs and a 'download' button lure suggests the document is designed to trick the user into downloading a secondary payload. The document body contains garbled text, but the heuristic 'PDF_URI' points to a URL that is likely part of the attack chain.

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://ponafet.ru/strik?utm_term=learn+how+to+speak+korean+hangul PDF link annotation
    • http://jikusofare.mywebcommunity.org/15997968212.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/v6POjc4/zefajowi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383680/normal_602c6db46a738.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471082/normal_5ff8dc0bbc3de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482219/normal_60021ee036033.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugewameru/BhjjfMy/doomsday_on_demand_2_apk_unlocked.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369164/normal_5fe3f72bb0db7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420586/normal_5feb634aa1afd.pdfIn PDF document text
    • http://sfhgfje5df.xyz/osrs_mimic_boss_guiderlksf.pdfIn PDF document text
    • http://amorexpo.com/anime_super_power_terbaik1sqb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417221/normal_603d50e053d12.pdfIn PDF document text
    • http://bukobaxaz.getenjoyment.net/68269423535.pdfIn PDF document text
    • https://cdn.sqhk.co/gelowidabik/hiJieha/42494886034.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380379/normal_5fcb911bd5b47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481161/normal_5fe5e62b59318.pdfIn PDF document text
    • https://cdn.sqhk.co/xavonepez/gmij6jh/66551996335.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00013ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC0 7968 bytes
SHA-256: 6a0aad435cbd04bc84baf3cadfdee7c96dd86bf79e47848fdfc7eabd4470abca
font_01_sfnt_off00015950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15950 5176 bytes
SHA-256: bd2a4063d35b17f96fba5fd46f28e8440441f0134340bfc82ee860c672cc5c8f
font_02_sfnt_off00016b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B04 10508 bytes
SHA-256: 9eaea41dde3c2bcdeeb864502dca4f0eaf12dd519789b22de78efc4b1211b634

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