Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6707f70c2ac711…

MALICIOUS

PDF

84.8 KB Created: 2021-09-18 15:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d7a18f0e098b066d8029dfbc5c3b3d9b SHA-1: d50434917bfbc5b383b23dd9121d9008848c1620 SHA-256: 4a6707f70c2ac711d43659db5c0f76e6b0533c2a6abbf3a2dac6a8ef68716a64
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several external URLs were extracted, with one identified as a link farm on disposable hosting, suggesting an attempt to obscure the final destination or host multiple malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/41401693576.pdf In PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/wuxakijobudululen.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/34791054608.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210916123540011633amf5v2.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/24764944916.pdfIn PDF document text
    • http://offerparts.com/upload/files/rofemumatabugasal.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/48139221356.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/69cccf3babd441b5fa77f7cb9d24aa16/3079680708.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/wexoxinababuwisefenu.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/kisaberigekumibutim.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/kasureroxagekanizafu.pdfIn PDF document text
    • http://koutingchina.com/upload/files/wafuvuge.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/sovasigepavokewaket.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b6513b16d---xakapuwapibusirekum.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/papawebiwijatowijevale.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/96923230957.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/14830805965.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109061344259019.pdfIn PDF document text
    • https://krossi.ru/images/content/files/6064301325.pdfIn PDF document text
    • https://flomogroup.com/upload/files/kazoxemirowijosunatose.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/86283159901.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/14097411031.pdfIn PDF document text
    • http://jaqalsports.com/files/file/686949156.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=train+game+androidPDF 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_off0000eb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0E 17088 bytes
SHA-256: b63d6fc6dc0a7aa17387ca7639f96854771982c1c408e3ae5af20bec0863f19a
font_01_sfnt_off00011716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11716 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2D 10244 bytes
SHA-256: 6b098a4f84445d2501fc33f24d59b79a5d504707ba68dbe9cf7138ee47e39fe2