Malicious PDF — malware analysis report

Static analysis result for SHA-256 56170af7ce6e8ebc…

MALICIOUS

PDF

71.3 KB Created: 2021-09-13 18:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a672fcb6b8b558e458167b95b6528634 SHA-1: b0f23048b9466ae7fbbe5d8957decc34fbd40ddd SHA-256: 56170af7ce6e8ebcc8809d03a1c33f83f552644b7ba12fdf999d42d607cfb856
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with high confidence. It contains embedded JavaScript, indicating an attempt to execute code within the PDF viewer. The presence of numerous external URIs, many pointing to potentially malicious domains, suggests a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that the document is designed to redirect users to external content, likely for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://kurashi-kyoiku.com/cms/dat/upimg/file/20980809906.pdf In PDF document text
    • http://castrolmintabolt.hu/images/upload/file/91979441665.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/gubinavutevuvovugiwawove.pdfIn PDF document text
    • https://forssh.com/userfiles/file/mibojo.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/zafoxanevipuxu.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/95791241721.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/49947141056.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/4515084654.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/rogorasukoribavinimoti.pdfIn PDF document text
    • http://favourtec.com/attachment/file/47254002876.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/d3db186d5b4281ceea7004a4c91c7d69/vudapedorapakitomarinajux.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/wiliwamilunazexuwub.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/zebaxemavewumero.pdfIn PDF document text
    • http://splogservice.ru/content/file/6868956195.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/mavumijitafafudidibasafam.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/mavunumasale.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/vulirumagumumurisabo.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/rubos.pdfIn PDF document text
    • http://orthodoxnews.us/file/14171015547.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139b248d89b6---91795309723.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/47851690720.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/94668067809.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/95799711061.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/52605352288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=dona+manuela+subdivision+las+pinas+zip+codePDF 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_off0000b1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E4 10844 bytes
SHA-256: 4ca65a4304fab99e5d07fa808bd4d31b1f33cdc5f22e440c95b420b4bc670c72
font_01_sfnt_off0000cab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB4 16968 bytes
SHA-256: 3ff4a758795194613c4b7c24e0f5d823075673d477eaeffd9f6b9ba6d3a8b700
font_02_sfnt_off0000f59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1