Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7bf19e75e25b22b…

MALICIOUS

PDF

73.6 KB Created: 2021-10-04 21:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 32ce83296a020ba8d341d4d9db09e84b SHA-1: 3824b5775a51c00b7bd61d763ee977afc59d38bb SHA-256: a7bf19e75e25b22b46e45545cf79c2c52fbadcf8af6759ec6c9a4becead51a3a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are linked to disposable hosts, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/somuzesizipewe.pdf In PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153f0e9f07c8---23422534133.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/rosogoradujebupo.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/35084151357.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/tejusarekidesopuxediken.pdfIn PDF document text
    • http://sakem.org/userfiles/files/gezikixoxafowixovi.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/xijonusavu.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/17573902872.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/rigemolagalelaradoviwud.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/sasekon.pdfIn PDF document text
    • http://cpviettin.com/upload/files/52281611283.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/rorebi.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/jumaxaxaru.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/lubuxalipiverunonovefum.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/63627117734.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/wuvukitu.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/75033334257.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/14864200886.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/43183729400.pdfIn PDF document text
    • https://ksboutlet.com/file/files/31100599817.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/21761613555.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16149b7c89711c---sezadefomunuvak.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/33206041765.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/62327540930.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=weight+and+height+calculator+babyPDF 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_off0000be28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE28 10828 bytes
SHA-256: 391daae6c517576d59fad003ecfbb5010b10031eea02078dd462ce7b8f2f33e1
font_01_sfnt_off0000d6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF3 16444 bytes
SHA-256: c955de4927fa3fe250b5e4e76a934178e6975257eb1bbf0c173edd909e031405