Malicious PDF — malware analysis report

Static analysis result for SHA-256 211ccae4a7085b23…

MALICIOUS

PDF

93.4 KB Created: 2021-09-21 04:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a1db56926c1d438aef5bf2d8ebe12093 SHA-1: bb385c51f6e7f8d1ddb23cfaf933b627d8e35ba9 SHA-256: 211ccae4a7085b236620830152e7f88ef4973c7defdf146b823251138d4a2577
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links to potentially disposable domains, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391272bf1f8---80564231251.pdf In PDF document text
    • https://madeinstlucia.com/userfiles/files/71303369265.pdfIn PDF document text
    • https://norservis.info/files/files/wasalabibupofujedik.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/92265412739.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613298fbb1e6f.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/pozenigozofexiwutidu.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/97232170429.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/35140509077.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/fexukodewal.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/19810804340.pdfIn PDF document text
    • http://haki.vn/uploads/files/jokudu.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/safatot.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021920526335307.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/50275752757.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/92382087725.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/3624178048.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/60207269945.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/vezajatupexipewatimosa.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210915161235.pdfIn PDF document text
    • http://glassick.com/userfiles/file/dimir.pdfIn PDF document text
    • https://jphotographyllc.com/userfiles/file/47471439123.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/82793031167.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=como+ampliar+la+memoria+ram+en+androidPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/dikosajegexabowomemepif.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_off0001031d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031D 10316 bytes
SHA-256: 4f62f78ccf23d976be34996b4bf6ace19e5280b9ef7535e6b1bdd7909b73d78a
font_01_sfnt_off00011a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3B 20164 bytes
SHA-256: 508a446d6fbf1b42cfce90ba53f728cdc31fc81f86c3859727625ffaec3d6aaf
font_02_sfnt_off00014e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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