Malicious PDF — malware analysis report

Static analysis result for SHA-256 506e8e75559d47e1…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 06:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 13a414dede53f0708527f56711075b60 SHA-1: a8cce0648b14d028eb7aa9c0ed4bc5066c22ddb8 SHA-256: 506e8e75559d47e111d91ef6987ff950bf3a44082716e44cea8cc75113700561
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 URLs pointing to external PDF files, suggesting a redirection mechanism. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://hugslock.com/app/webroot/img/files/seruzulubimepo.pdf In PDF document text
    • http://tantusmarina.com/UserFiles/file/64792764990.pdfIn PDF document text
    • https://synersys.fr/contenu/file/87514748942.pdfIn PDF document text
    • http://abnicum.com/files/file/vebibuvijis.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/14527794878.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/pixafarunopifamubuzile.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/miroxi.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/lafuwizimikiduk.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/25120080239.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/taxobaposatogudemidaja.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/wuxoziwopaxararawe.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/97311567042.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/90625254497.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/vosumawulawowogireturabe.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/7009302412.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/60226365352.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/wijefem.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/wagumesepazom.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b2948bc01---9747162096.pdfIn PDF document text
    • http://poiskvod.ru/images/file/jivop.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/0f6ce4f6c033fa06748621ce62780838/87651144497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=papa%27s+freezeria+free+download+apkPDF 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_off0000d560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD560 17504 bytes
SHA-256: 75a1502606827cdc54bf0b90c07fa75fcec9290fd0a06374cec51a2d1d96e3b6
font_01_sfnt_off000102fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FC 10668 bytes
SHA-256: 2e51c3e41f397fec03285086ddefb8a2e0efed1575e1917dc07fa0b39a71e200
font_02_sfnt_off00011bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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