Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b7407fe87ca226…

MALICIOUS

PDF

69.9 KB Created: 2021-09-29 10:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fbc59b23cab4be020a37344cbe8b4b90 SHA-1: b247901fdd2e5fa995aa7198b2475ddbf14bacb6 SHA-256: 13b7407fe87ca22645beaa68db5dcffc367d54f6435d79346c56f982ce0a6dc4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains associated with file hosting or link farms. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high likelihood of these links being used to distribute malicious content or conduct phishing. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect the user to malicious sites, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://delifarm.com/images/file/rebixoxemamadovikufagav.pdf In PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/58134771514.pdfIn PDF document text
    • https://jck.ro/userfiles/file/10061149619.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/39064289297.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1615365efefc32---91315471887.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/jinidijod.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161307853c1627---vopikinaramodudonuborex.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/68135548935.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/50321170245.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/33894529572.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/basowameraj.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/gesasedubipoluvidezen.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/regetadop.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/wekesularidoxafurelurupux.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/getukupelorif.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/fulevukajidu.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/wosixumuxome.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/45555310969.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/vorepasi.pdfIn PDF document text
    • http://mackits.eu/image/57631297416.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/72159228301.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/31419345385.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/karijatesedesu.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/ruxujexoja.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/xaxejoga.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/goxeminubisuzasopa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=google+play+services+auto+updatePDF 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_off0000b2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AA 15140 bytes
SHA-256: 0b96b58597de09e92ffc832c27a276e08dfb334b808b5d3ebfcfbfa56b1e83ff
font_01_sfnt_off0000d8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D4 10904 bytes
SHA-256: 35f79b6f81877cee067456cf367bb5c011aaa0fa82e2ea125c492bc3d1534428