Malicious PDF — malware analysis report

Static analysis result for SHA-256 522db59f83da89e6…

MALICIOUS

PDF

120.0 KB Created: 2021-09-09 09:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2466078633387523c1c52f06a73599f9 SHA-1: 9150ed09c0496dfccee02994ff7e00a954f8d90f SHA-256: 522db59f83da89e61a7ae9114a626952f34bbbcf1ac4d34310a18b1fb9403372
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is part of a link farm, and the ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely redirects to one of the numerous unknown URLs found in the document, potentially leading to a phishing site or further malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://russia-ex.com/images/blog/file/68027861821.pdf In PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/wuwuzoke.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/90316822542.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/18978722.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/nawizi.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/51804283115.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/35090687294.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/zikawoniwavuwo.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/fopanogiworil.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/lemizonak.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/imvq5qr7nchhciedaakurkn79e/zugagur.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/natozilopid.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/161306ff082190---28007663168.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/tiruwo.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/13774773064.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/senetujarakutamowimip.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210904/2109041531095462350iyh16w3fl8s.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/sodude.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/85792683018.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/8e4d98e7e7fa4a725b0ad37fdbd74f25/5084654398.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/16394853484.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=y+technology+wordsPDF 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_off00016eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ECA 10580 bytes
SHA-256: 1a2de787963300dcd395e3fd6c65b6dc206acf7826dd7bf8b8b6e3e6c2694797
font_01_sfnt_off000186bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186BC 19908 bytes
SHA-256: f2f20acd4a4f9a4bec68a979fa937ada538fd033d1658a9f4bc66e4ff980cc03
font_02_sfnt_off0001bac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BAC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1