Malicious PDF — malware analysis report

Static analysis result for SHA-256 654114063aac1728…

MALICIOUS

PDF

77.9 KB Created: 2021-09-10 20:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e8939efc427fe2bccf86f393eed6dbc6 SHA-1: 9ef8e378b1337fbe0d7df0216b9bfe31844a746f SHA-256: 654114063aac1728b4871a748ac90a546833dda8fbe131b3e6f8f820f876c573
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, with a high ML classifier score and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://fpcofmacon.com/nbloom/fckuploads/file/vokutajesotusubosemevawa.pdf In PDF document text
    • http://gtlitalia.com/userfiles/files/zuloju.pdfIn PDF document text
    • http://protok.pro/upload/files/dagogininitoruwolumixil.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/naxivupipewawi.pdfIn PDF document text
    • http://scro.ru/pic/file/68416051149.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161302fdaa71f9---30071417029.pdfIn PDF document text
    • http://pileki.com/imgup/file/zivugejenazopigeduvonive.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109090646444159.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8186d4978---zamosaladefawoxan.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/wibakokarituvajef.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/rujinos.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/senujetep.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/zumirasefopilawozivil.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/58219024332.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/zolamuwozuvajobotozo.pdfIn PDF document text
    • http://happy-land.hu/editor_up/67091054989.pdfIn PDF document text
    • http://c-amc.com/upload/files/bakopofumu.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/gubofibasekagowozomexuv.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/zupefolegu.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109020222430732.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210906143642.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/jiwul.pdfIn PDF document text
    • http://budropol.de/Upload/file/nujifoxobowokuwixiterep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=hide+photos+video+and+app+lockPDF 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_off0000cbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF1 17884 bytes
SHA-256: 7f79facf644118ec18bd9b4358dd87ee50025f249e4f4d75d073615273d0ae6f
font_01_sfnt_off0000f9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001120a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120A 10660 bytes
SHA-256: 6037af013568a4030b1f4b8767328f17736b62d4c72564442ae4d531dca673f5

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