Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc8b1d1a186aa982…

MALICIOUS

PDF

88.6 KB Created: 2021-09-10 21:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e2ab2d106d85b2e33c47141555aab470 SHA-1: 1395ccb1d03e70cd27d6d17e5b4ba12f4396fcfa SHA-256: cc8b1d1a186aa982406a912336024766deb52c15aed328d430459ef38bf0c146
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with a critical heuristic firing for PDF_JS indicating embedded JavaScript. This script likely redirects the user to a link farm, as suggested by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous unknown URLs. The embedded JavaScript is the primary mechanism for executing the malicious payload, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://goodline.by/userfiles/file/87262626442.pdf In PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/84304033760.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/gipowusepeparuzosa.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/43233742432.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/87920802271.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/81413193241.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/vitejituxapijojiro.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021090616253073499.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/5746928079.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/zitipemezumineguposa.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210904110111_6bv8hj.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/52833850006.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/zesisipudami.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139ed269010a---remuborigevamirogozozu.pdfIn PDF document text
    • http://spharma.ua/files/file/sewifajemevefapuripe.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///pibamofuvo.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/berexinawesozek.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210903_6EB86EC353DCFA01.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613520f9e1b63---dasuz.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/62242245378.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/12178899217.pdfIn PDF document text
    • http://midospa.com/upload/files/79695394107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=s9%2B+vs+iphone+12PDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/54591104520.pdfIn PDF document text
    • 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_off0000f501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF501 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D18 10424 bytes
SHA-256: e8739839260f6864f655436f4cd59fea0b8be46ea58acecf7aa7669ac57f6a70
font_02_sfnt_off000124b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B7 18680 bytes
SHA-256: 2e1b82378e8e74df9e0d09a7524e09ead296cd4ca4e43f9e9e1b47d0f816c904

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