Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6de65f50aa5be09…

MALICIOUS

PDF

84.9 KB Created: 2021-09-19 00:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ee7bced01554ff4a51b26adf6d01eabd SHA-1: 82918feef6d2ebdc20d1706b194bb93f1e1478e8 SHA-256: e6de65f50aa5be099565f0a5fc71c0262b7422a1a353e1314646304fdf2e0cf8
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that these links are used to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 http://www.ocptecnology.com/admin/uploaded/fck/file/94808647704.pdf In PDF document text
    • https://partnyor.az/userfiles/file/visasomivunafobi.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614288990844d---mutikeluluvaruxulumerub.pdfIn PDF document text
    • http://gerocuki.hu/user/file/39577149705.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/93807203625.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/mofodejulefagozexi.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/75438254781.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/o4nj3qtq2k2ln56tcv5jhpcai6/xebirija.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/xexaviwolisuvoxideratu.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/fosutinodizasumizute.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109021847175343.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/97484260607.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/96131248967.pdfIn PDF document text
    • http://haphadoor.com/upload/files/putexowuxobi.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///35040114627.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210907_12FA91A492FB25A5.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/dulezatene.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021091312274522.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/suvateladuvidegowosab.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/63009983216.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/takutefobuxuf.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/denogonuraribuzedegul.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/98843639133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=jekyll+and+hyde+free+pdfPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FB 18664 bytes
SHA-256: cd828d5877bdfa26350a7e2bde68e2d172b8b8b2fa755e644ccd7c59779551f9
font_01_sfnt_off00011693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11693 10316 bytes
SHA-256: 5e7e490748a1848f0809d2b95e24e5f89768b90f51862e8302cc70d6acd58507
font_02_sfnt_off00012dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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