Malicious PDF — malware analysis report

Static analysis result for SHA-256 da740eaafa4793ad…

MALICIOUS

PDF

68.8 KB Created: 2021-02-18 12:40:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 94bab44f5fd9bf5090544d075c8f5bd2 SHA-1: b767b97a2fec201e3b992fe05a6f137365c9d5a7 SHA-256: da740eaafa4793ad65db32701ea74730dd36a844ed0e8fa901e9c5c84ff329d9
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating the presence of external URIs. The embedded URLs suggest a phishing or malware distribution attempt, likely disguised as a document related to 'USMLE road map gross anatomy pdf'. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/wix?keyword=usmle+road+map+gross+anatomy+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471985/normal_5fd8d75bd9d23.pdfIn PDF document text
    • http://zarabatyivat.ru/100_bad_days_lyrics_meaning00rry.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470687/normal_5fcb65913dca9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447250/normal_60130c6659bd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485799/normal_5fe8cd0308e18.pdfIn PDF document text
    • http://fb-pageunderreview.com/60061927403d4sno.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421329/normal_5fde3f5201acb.pdfIn PDF document text
    • https://cdn.sqhk.co/nopawuwam/jDdIAha/clear_guard_transparent_film_screen_protector.pdfIn PDF document text
    • https://cdn.sqhk.co/fezifenax/ggeKXCw/tewavusixemorema.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417669/normal_6014e3a2424b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382430/normal_5fc8d12760660.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455195/normal_60104a7451a99.pdfIn PDF document text
    • https://cdn.sqhk.co/panafilaputu/hjgdc8S/75955387092.pdfIn PDF document text
    • https://cdn.sqhk.co/fevivesuxofo/RLfajbz/96499572742.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384026/normal_5fe97fe85226c.pdfIn PDF document text
    • http://icub.tech/fidibufugepill1ap8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369142/normal_5fd66758c89ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393772/normal_601b6334ded70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449615/normal_6012620e92684.pdfIn PDF document text
    • https://cdn.sqhk.co/netimupoxojo/bQhhjja/21305294945.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF9 5456 bytes
SHA-256: 8669a96146640ba551ea0467799d62a063d74f495283161f90ebde8b0c78a615
font_01_sfnt_off0000e178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE178 10756 bytes
SHA-256: 18a6a6132b09b4aea8fafa69c859d050bce6963138a52fb12c9ed73d0fef6d54

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