Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc4eda4556d2a1d…

MALICIOUS

PDF

83.5 KB Created: 2021-09-17 17:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: deefea9f64b500e0a26f9f5af8d43963 SHA-1: f1b7ac03e81ceade2e196f2b748f89cc5ae4d89a SHA-256: ecc4eda4556d2a1d666ee97a0bddeeb8327a3afb951a08f7c04bb1c3462d5fbd
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The 'SE_CLICKFIX' heuristic specifically points to social engineering, instructing the user to execute a command, which is a common method for bypassing security controls and downloading further malware. Embedded JavaScript streams and numerous URLs, some of which are on potentially disposable domains, further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://ags-car.60km.com/upload/files/48890965116.pdf In PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/63123022498.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/vagekofojolufufokizosu.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/13408965417.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/39366127868.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/futuxifizelepopofebalop.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/gedisizal.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/zurexizabukusebaje.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zitijimido.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/petibujoluxam.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/18775633441.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/9242228528.pdfIn PDF document text
    • http://budka39.ru/files/xatoki.pdfIn PDF document text
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/68970941290.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/94946915628.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/fanovanoxedagigejix.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210916010542.pdfIn PDF document text
    • https://jphotographyllc.com/userfiles/file/norow.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/171055456735.pdfIn PDF document text
    • https://gornjastubica.hr/files/45662312421.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/25910620542.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/71219979513.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbf9f368d6---tazilerenitedewubikanax.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/79505650901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=best+android+box+launcherPDF 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_off0000e0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EA 18128 bytes
SHA-256: f8d5a4e932745b18e13a955f23839942c57c1e51057cfca0d8175d86dc3b19ee
font_02_sfnt_off0001276e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276E 10864 bytes
SHA-256: b848cf73bf04a85c7e37f41e5ebdfafc8a4b365208e77723ac9bd7c1bd1f9d92