Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c8768992bc57d31…

MALICIOUS

PDF

71.9 KB Created: 2021-09-09 11:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ad0c87815be704bc76e1ce7a0fde5833 SHA-1: ad09bfe274cbbc324006e972dc6abb7287e3686b SHA-256: 0c8768992bc57d31592b9de889a5f622f93b8297207b6a9177f8554bf7dd0007
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links pointing to various domains, with a significant number of them being disposable. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farming on disposable hosting, suggesting a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of the file. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/3db0c327eae0fe5659906fb2bded1edc/80144204800.pdf In PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/jenozurog.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/bidufavuliwigireberi.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/24069914059.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/bakinixoki.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/vizedetaxafib.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/jenejalozepikupivukaromuv.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210907/file/sijuzigutawumik.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/nasatel.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/40003776069.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/datis.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/xisefofut.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/13272138861.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/suroxo.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/38636151088.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/87478383965.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/remewitexexabig.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/48278470636.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/zukuxateku.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/phrj7eakhqi8eecm05op089jnk/30551909230.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=allwinner+h6+firmware+downloadPDF 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_off0000b3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF3 10588 bytes
SHA-256: 62f29488e5f21e2bb49305f1a5a03f96a02a02d7aa47cb1b8e988fb7d23f2562
font_02_sfnt_off0000e3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F3 18100 bytes
SHA-256: 57a13667bb8395617878ddaddf62b571f297e0c5aaf550cac429043d0e29cd20

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