Malicious PDF — malware analysis report

Static analysis result for SHA-256 10eb733a274346f5…

MALICIOUS

PDF

105.9 KB Created: 2021-10-06 13:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: ecad0be3a235260040817942156a295c SHA-1: 074ede8ed0da28984094215e87ff223b7dc60de4 SHA-256: 10eb733a274346f593d2b246f53b22ca343c2367d21b62ae85d6f0905c5293f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://garglob.ru/uplcv?utm_term=baby+puffy+eyes+after+sleep PDF link annotation
    • http://speckrepej.com/upload/file/pakuvexelarozaf.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/lajatatuwonikifugebekuj.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/36749874728.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/28148249644.pdfIn PDF document text
    • http://xn--42ci4cc0aric4a6dd7c5af9nef7sg.com/userfiles/files/62572600700.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/47569343871.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/gozeniwugidogi.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418e53b113c---pofukebibu.pdfIn PDF document text
    • http://snsi.jp/image/news_file/tipexamokekemokunajurer.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/nikumanilarep.pdfIn PDF document text
    • https://kawanmto.org/contents/files/22681842779.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1615813fae14e8---86492989481.pdfIn PDF document text
    • https://bandloc.com/FCKeditor/file/88475032071.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/18359523110.pdfIn PDF document text
    • http://dytac.hk/userfiles/99211840834.pdfIn PDF document text
    • https://clinicscrm.com/img/files/55515041203.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/kosusamegagamexutefurata.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/xukenawozozunuzuluxasosal.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/18623418831.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/napajitunivaxofamadowaxax.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/52250808472.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/86862120624.pdfIn PDF document text
    • https://netpage.info/userfiles/file/pexalilud.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/zunijusiko.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://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_off0001324c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324C 10444 bytes
SHA-256: 147b048a9fec527ecbfecb92a6cd4add77d62ca392870e866986872fc4917778
font_01_sfnt_off00014a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001621a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1621A 21152 bytes
SHA-256: c06ca8917333b725e6e551ab305c1aad157db61017e1852f217bea5e6a5fb5c5