Malicious PDF — malware analysis report

Static analysis result for SHA-256 21534e6f22fee7bd…

MALICIOUS

PDF

83.6 KB Created: 2021-09-19 02:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 24c5d4fbbb59982857b36d27ab70dbf3 SHA-1: 4b0799e3af842c951547931a2cf9500750261ddc SHA-256: 21534e6f22fee7bde24be848983a296e861ddf982db7c180aa0b9db5c353f9e7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, such as the one found in the PDF_URI heuristic, which is a typical phishing or malware distribution tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://defi128.com/userfiles/files/goxoxaguzeruturunelom.pdf In PDF document text
    • http://ndt-ultratech.com/files/pufimegupaxik.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/d04f2a07a500def588e5c4ef94a77a83/39643801363.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/godiwutufepugilile.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/37146370072.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/47244338569.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/metowafaxa.pdfIn PDF document text
    • http://underbutter.cz/download/foto/32523042371.pdfIn PDF document text
    • http://stroi-sistema.ru/img/fulepipedofufodutozid.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/bogisupunilizisosu.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/29801602543.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/97094445176.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/98188934015.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/jatiwulepuvojeradebi.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/44111222051.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/vejunasuk.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144cb18d6cf6---70337138219.pdfIn PDF document text
    • http://fitviewer.de/files/file/xatap.pdfIn PDF document text
    • http://gerocuki.hu/user/file/ludesanonadixatoti.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/72024977868.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/tovipuraxevofofes.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109090705032377.pdfIn PDF document text
    • https://onecre.com/images/content/files/tewevopakigonenirababumi.pdfIn PDF document text
    • http://client.diffuse.info/files/28696617242.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=vky+gaming+cricket+19+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_off0000e02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF841 17900 bytes
SHA-256: 9edee948b432d8174474389cb97fa4bdaeef5dd084d5ecbb2c72b10e392038ff
font_02_sfnt_off0001271f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271F 11028 bytes
SHA-256: 1c3bf5fd578ef9447ff3276d267fc6b8df720cb2ff7c62b0a751524cc36c8f0d

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