Malicious PDF — malware analysis report

Static analysis result for SHA-256 2df7cbe4293d31c1…

MALICIOUS

PDF

84.8 KB Created: 2021-09-11 03:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1f0867948cc8b4fa2c650c99ce4eda8b SHA-1: f2c227015f239fe7bd108ca610943c74d3d6f153 SHA-256: 2df7cbe4293d31c1e9580ca1d763369d4c483f86b89bd61efd896aba86303103
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a secondary payload via the deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gdfsztal.com/uploadfile/files/sagobakuriliwomarisal.pdf In PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/72067541273.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/60047389543.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/givobogosizexubos.pdfIn PDF document text
    • http://snft.ro/media/file/jixexepamavixarakitojos.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/30790170871.pdfIn PDF document text
    • https://norservis.info/files/files/39690022282.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/67588408911.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/tixosidaga.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/1298980878.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/90999737261.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/60623507421.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/koxelebopulodepap.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135e3983763b---4298796665.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/jelifi.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/93926988786.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/timefosofi.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/vugobawifa.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/3659938703.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/74817168136.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/16223532890.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-7/20210907190901226708.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/2b55dd4618089e359f5403bd1d9e930f.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/sikime.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/wifazoga.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/fefidi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=dls+19+mod+apk+unlimited+player+developmentPDF 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_off0000e475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE475 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8C 11144 bytes
SHA-256: fe1c271bc61c6d877c9ae2252f11678a96a4c8f07e6e3da0ec0c29e3bf0312d3
font_02_sfnt_off000116a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A2 17952 bytes
SHA-256: 7de21bc11f1e3cdaee028970d27f6e078b1094f3d818e29cd39046190ea06bc4