Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc115d32d7301e49…

MALICIOUS

PDF

88.7 KB Created: 2021-10-18 08:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: c1dc0ea2b88e7c6873b309835b73fc36 SHA-1: a6ccec2aaf357201393ffbca8fc89b1eef37a42b SHA-256: dc115d32d7301e4930c1ac000cc23fa699928b6c597ddb99529b2eade02216c4
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. This script likely redirects the user to external URLs, as indicated by the numerous external URI findings. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://malir-naterac.info/UserFiles/File/tutakavabekudepokis.pdf In PDF document text
    • http://www.deep2001.com/images/library/File/45088727274.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/kowebizudab.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/tizawotufilileli.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/tewitarorirezefuzetom.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210930_115716_1759.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/gakanonirejivojo.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/dofofifo.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210929141803.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614914f48d15f---96842764217.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/32990631726.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/tewibinowavokojo.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/29297167447.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/kikanelesola.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/zaxuzizenokinabemizoketi.pdfIn PDF document text
    • http://4yoga.by/pics/files/monigabedemupotubitim.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/nutinirasimewoso.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/95ci54hpq8imq8q7oe0kj29rhc/zodidemebugigokutufa.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/16000681472.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/62319829510.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xatibizad.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/71933389721.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/65662371284.pdfIn PDF document text
    • http://proxima-design.cz/files/file/81447784937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/7xhmvLXWVJc/uplcv?utm_term=free+stuff+to+get+on+your+birthdayPDF 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_off0000f174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF174 10920 bytes
SHA-256: d664f031df7696439ffb26e5422fd83acb8170456bdfb493db1ece66b9d81503
font_01_sfnt_off00010a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A85 19156 bytes
SHA-256: ed3f5503591610e4f2e9f17f4b77dd9270831a724b87975bac0eef3bc8cfd3d4
font_02_sfnt_off00013d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1