Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a21c6d46d11d65…

MALICIOUS

PDF

83.2 KB Created: 2021-09-16 08:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e2a16b020ec543d71c54f2099656a344 SHA-1: d9aa192f73ef78a69e81b96db4f6b099bc72b8ef SHA-256: 61a21c6d46d11d65f5e1d4a11b6fc32cf40a170c20faa82932c83aca357ced03
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute further malware or engage in phishing. The embedded JavaScript is a common method for executing malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://aumnat2car.com/ckfinder/core/connector/php/upload/files/11400029385.pdf In PDF document text
    • http://www.smartusb.info/images/library/File/somubitofudiwuruneze.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/6977395442.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/45529709243.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/47327841206.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/38756501218.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/54944855440.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139704b196d6---foxakubusu.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/xujoluwelazipix.pdfIn PDF document text
    • https://coevent.ru/upload/files/43869212772.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/lotifejimifinovekurevib.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/71669572294.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/39096019409.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/69403137309.pdfIn PDF document text
    • http://khacvietlaser.vn/public/images_news/files/81553638388.pdfIn PDF document text
    • https://bselink.com/userfiles/file/vewidif.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/27558461609.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/57941020489.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/52362730274.pdfIn PDF document text
    • http://moneymaker-gold.de/files/94128259488.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/3108201387.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/25944745840.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/nojojabufadalajuka.pdfIn PDF document text
    • https://coop-alternatives.fr/images/images/lomubakegapapak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+save+contacts+from+android+to+pcPDF 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_off0000df78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78F 10880 bytes
SHA-256: 0d7da0da576a15759e296ae2a0b8f3bf2916bdfd91a4f7ec17d3890026077a5d
font_02_sfnt_off000110b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B7 17872 bytes
SHA-256: cc81051b0ac0e120baeabcbd506ed52190762c83978a53698715d8cac0ab005f

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