Malicious PDF — malware analysis report

Static analysis result for SHA-256 b589a5d780ad7342…

MALICIOUS

PDF

75.0 KB Created: 2021-09-21 09:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9b51c858198005820efef2572818a3f5 SHA-1: d285587b77e2e2ac6c7de82cb124a4f64727e518 SHA-256: b589a5d780ad7342efa7ca64a81b8872321b762b8759f957b2c62cf54d1fbaac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a common tactic to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • 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://huntic.ru/uplcv?utm_term=law+and+order+svu+s22e03+torrent PDF link annotation
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/juxamozelega.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/15323428931.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/161420f63cf0ea---8362176743.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/fajiwomeb.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/xewofajazutejoliguledora.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/zolawabuwujowadurodixu.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210917111200.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/1292394525.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/91112861939.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/dukulusaxasikopefunodizol.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/10277986305.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/vetowavemi.pdfIn PDF document text
    • http://biomedia.asia/upload/ckimage/files/74193405.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/niwixekapof.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/puximi.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/85704412696.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/fijume.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/30076982831.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/1168604936612f906de390a.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/44392044494.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/0de67d0f72c301f5ec1bab18d67367e7/13681423641.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_off0000c08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC08D 10724 bytes
SHA-256: 1f59e13de1ba9f4b2c03e79849cb743685bd3e83094dad74e8279dae972bda40
font_01_sfnt_off0000d977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD977 17484 bytes
SHA-256: 2107afdda733e0c4234220be632c6e77d40d674ff4b7899c3e137aedfb874ccc
font_02_sfnt_off000106ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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