Malicious PDF — malware analysis report

Static analysis result for SHA-256 34d6f94680caa250…

MALICIOUS

PDF

77.4 KB Created: 2021-09-12 09:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a71cba8ba26f51cc74353013ee96553f SHA-1: aadba06787ce4eb7bc766e50b4e3dccda8671355 SHA-256: 34d6f94680caa250c8822657cff6e882987a7ed9332a2fb8bdff4866a1053f91
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript 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 redirects the user to one of the numerous external URLs found in the document, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://tlw.ro/UserFiles/file/18150444452.pdf In PDF document text
    • http://nemdanangpho.com/uploads/2021-09-06/images/files/fekebinimibekov.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16135ceee34378---banawavozifudazidigot.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/74400327330.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210908014809.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/40816026536.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210908092228.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/60147776373.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/27043679899.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7ce600d5b---zozogujujazexipevas.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/29193508917.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/40544074162.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/zukifu.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/kukimogaxexale.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/rugazopetijarusa.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/71704694219.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/52595710889.pdfIn PDF document text
    • https://network-italia.it/file/57314254122.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/22558706538.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/pimobit.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/95289584435.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/60440873114.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/raxexowafiv.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139206a7798d---duzodirilodisujugunesewuw.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/40298807844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=pioneer+b1%2B+student%27s+book+pdfPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/46477951285.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_off0000c69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC69C 18760 bytes
SHA-256: 2d994c49edbb08f1085a5fe702b7a122dd93b0b00d4323536a1d48eb76299e06
font_01_sfnt_off0000f6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A5 10704 bytes
SHA-256: 62041aa14b5cb3617f0b0575ee87496382ff63d9f264580a9aae6c7148b440c5
font_02_sfnt_off00010f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1