Malicious PDF — malware analysis report

Static analysis result for SHA-256 6546f54dc6670f33…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 13:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f09a6144ca0a79b5ee23d10dedf7edad SHA-1: a50f9763640f4a56ea563a4dcfff796cbf81605a SHA-256: 6546f54dc6670f3392d40c68e21ee2b5f19dbdf1a88ab8b70bdb958d0e7c04a8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are then used to deliver further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://portaldo.eu/contenuti/upload/file/65674741134.pdf In PDF document text
    • http://leebyunghun.kr/new/upload/board/files/90384746095.pdfIn PDF document text
    • http://alhegazgroup.com/userfiles/file/visifotisubogakowajeleku.pdfIn PDF document text
    • http://nenorm.com/files/files/sazek.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021090805301773499.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/jatunivofisexuwen.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/wipuwonujijedomat.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/misumuve.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/50482512737.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fee6251426---571571509.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/napamu.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135b5aa819a8---lilov.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/191253197.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210914044652.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/rozunosawepusug.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/6114238726.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/xixiwig.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/45466629471.pdfIn PDF document text
    • http://bidadapatidar.com/userfiles/file/31031419460.pdfIn PDF document text
    • http://vhz.cz/user-files/tusajusugaladezojobo.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/75297215971.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/mazogipamerotukawigajuzew.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/38425243399.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/sejanemamada.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=fortniteboss+free+skinsPDF 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_off0000dc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF430 17344 bytes
SHA-256: 4f21df959de21a268ed485779ada2d679af9ce363ac1201dcf2284955a7e3a7d
font_02_sfnt_off00012147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12147 10208 bytes
SHA-256: 52e5d348aaefded2422985c9dcb4fd11636bb101a1bddce633b1f743a4ee9b95