Malicious PDF — malware analysis report

Static analysis result for SHA-256 df1afd798054e502…

MALICIOUS

PDF

72.5 KB Created: 2021-09-14 01:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 35782ca0095c3ba174e032c2380b69bd SHA-1: 69f05596fe6055fa9222ee2652e3eb5eb2900198 SHA-256: df1afd798054e5020ea23d8f8ee2ad68b56fb2e20a460e06744d72bacd17a3df
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external links, many pointing to unknown domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lobigubez.pdf In PDF document text
    • https://mmeasar.com/mmeasarfiles/file/befumugodumikemopobozukur.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343b3a94200---77224817991.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/23462062024.pdfIn PDF document text
    • http://coachhouse.info/assets/file/faladosunugirapisu.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613066e510699---73390322282.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/74257547738.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/lefadedetemezituwozinaz.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/nudoxomure.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/rupurememevanojivevupobow.pdfIn PDF document text
    • http://rsentco.com/upload/file/96041974042.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/28277902043.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26675360416.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/14829364087.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/tolalirepajenaga.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/51400070616.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210906172758.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/63775190131.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/polonoxanat.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/14309422925.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/tuwamibadobinibotaragi.pdfIn PDF document text
    • http://ndt-ultratech.com/files/mupumiwegomajikazo.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/vasugakekiti.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/639859233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=transformers+2+full+movie+online+freePDF 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_off0000b76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB76B 10528 bytes
SHA-256: 5713b20c88ed546aea678f9d3e02f7e50a2180c43fdcc9909a5e4fd58813469b
font_01_sfnt_off0000cf6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77F 17288 bytes
SHA-256: dbae5d7888b48d27dac23f0679ba4da77617b3daa845729a4dd55318f11afe21