Malicious PDF — malware analysis report

Static analysis result for SHA-256 568a227b6be4a37a…

MALICIOUS

PDF

71.4 KB Created: 2021-09-27 13:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 411cde422ca0e0024250e4bb15e9b965 SHA-1: 58c5b46039dda10bf017882ca870db56a1de5c69 SHA-256: 568a227b6be4a37a60b721c1a49a88c0c6a2f60ba3f830e4cc1a56e004b8972c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous external URIs pointing to various domains, suggesting an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://esistore.lu/userfiles/file/98887742434.pdf In PDF document text
    • https://najemwroclaw.com/userfiles/file/zimitubelatilusu.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/65652841313.pdfIn PDF document text
    • http://raczcsalad.hu/files/degofewipuzakozilewij.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210926/file/sokaxapavexeb.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/93800518204.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/8800516516.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/71251084708.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/zuriterurelerofitemax.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/tokesopofijopane.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/33206846837.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/43274679120.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/lusilitewamifa.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/21718079292.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/xazoga.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210903073101.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/vapiluvejalajekuwaran.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/94796748820.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/toriwidexozotarawajojo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150c635b49c5---rofofamigajaleliluburu.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/vanurituvigusutiroke.pdfIn PDF document text
    • https://avela.md/userfiles/file/27727472323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=wpa2+apk+hackPDF 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_off0000b474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB474 17852 bytes
SHA-256: f48db78e8fd161ad581380feb9a2876243ff3bc433bc919c6bbdfae9fabc9e3b
font_01_sfnt_off0000e2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D9 9816 bytes
SHA-256: 28260a188cdde2916d2e44c6f5f3e2018353d59cd904228a1f50c0f107c4f954
font_02_sfnt_off0000f89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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