Malicious PDF — malware analysis report

Static analysis result for SHA-256 0440777d5b9b8053…

MALICIOUS

PDF

81.2 KB Created: 2021-05-28 16:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0cc28658b180f0d85a9d465bc38761d5 SHA-1: ebe4d67d390d063551fee97f6c435195f3b2c041 SHA-256: 0440777d5b9b80537eee1841073d47348f46914c019f80cba6d267d673eb9691
136 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains an embedded URL and a heuristic indicating a lure to execute commands via the clipboard. The document body, though heavily obfuscated, suggests a 'free robux generator' theme, a common lure for phishing or malware distribution. The primary IOC is the external URI pointing to a suspicious domain.

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://jumiwimov.ru/strik?utm_term=free+robux+generator+2016 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393220/normal_602e0d8d02e59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367301/normal_60111f3032726.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488316/normal_5fcaa41c1f5e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473031/normal_602c2eb1cfb89.pdfIn PDF document text
    • https://xejajunuzu.weebly.com/uploads/1/3/5/3/135306682/25c615e3a13b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446147/normal_6004d16e243dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457305/normal_60182f34986b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479684/normal_60368bce094cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498330/normal_60032aac22e3a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452609/normal_5feb1eb14e2eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469852/normal_5fe54f1999f43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460447/normal_5fe4b7518e843.pdfIn PDF document text
    • https://bidegibi.weebly.com/uploads/1/3/4/4/134476665/zumuvorebilakonivo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479212/normal_5ff995ee36b8c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4655978d-5145-468e-a09c-426db97bf2e5/66873755398.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e76df16-fb3b-456c-87b2-c965e469457b/govutata.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c048ac0c-401d-4105-aa85-cc5d517c8b41/ugly_book_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/473964bb-ed8e-4cd6-a7e9-84c0fa46d367/48399412018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc5ec9a9-2e53-4bd8-b94a-6753f227b72a/taauk__talat_ve_fitnat_kitab_konu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a03cab7a-f3ea-4422-a91a-cf678ea15105/71557559360.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_off0000fc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0B 5284 bytes
SHA-256: 78518172761615d38dd1d64a1653eecd06ab0cdca931aa1073b457f7100babf8
font_01_sfnt_off00010e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E27 12232 bytes
SHA-256: 4644ad848037109f222c89fbd377bc5c1fe77e0ebca4b5c19cf589c826c4a413

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