Malicious PDF — malware analysis report

Static analysis result for SHA-256 db4ced8df4b7bf1f…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 13:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 88b07b520689753927b04c4167ae7e00 SHA-1: a83e4d299c3a265e4bee2d0ca2eb7b6fdd654957 SHA-256: db4ced8df4b7bf1f59f74b433cd0c259a96c841354159c24a6d899fd910b031c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also exhibits characteristics of a link farm, with numerous external URIs pointing to disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded JavaScript indicates potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://balie.overeembv-profielen.nl/upload/files/64587531927.pdf In PDF document text
    • http://ride-on-earth.com/images/blog/file/roxonasasepuv.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/90704037050.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/84499698953.pdfIn PDF document text
    • https://atrax.hr/files/34953823577.pdfIn PDF document text
    • https://andhimazhai.com/images/files/35966961971.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/jemetutijogadotuzubus.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/a173f9b7238fbc46f3df01a9d6ad1a14/xuvanaburivunakozanu.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/71045745099.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/nugamijewivazepidu.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/58927780198.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/73599156772.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/2392656032.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/nomegesavetotugi.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/gewosavix.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/46567954828.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/pagofopovena.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/65400938977.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/60758190039.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/wudulavapetizilapirimonet.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210920190829.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/zanexatetid.pdfIn PDF document text
    • http://vinmexindia.com/uploads/32404909777.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/wajugujanev.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/jodajudasodet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=caustic+apk+downloadPDF 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_off0000d65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65B 17644 bytes
SHA-256: feaf0957e8f5ea43638dd6e1d7336a863f4ada4834413c617f7d1e88e9e72d3b
font_01_sfnt_off00010413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10413 10584 bytes
SHA-256: 2e903c8b418243f2aa6a5d6eb3bf377487420a1092b9433e198405a298c40c94
font_02_sfnt_off00011c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1