Malicious PDF — malware analysis report

Static analysis result for SHA-256 55fc78fa6c483a1b…

MALICIOUS

PDF

69.6 KB Created: 2021-09-17 20:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 22755ca5a1d3f2f13943904f422d927e SHA-1: 5b3b6f38d589dafabe40b0786c86115655f0bee6 SHA-256: 55fc78fa6c483a1be62896efa746036486acf97c62d63f9eefb627befe3e01c5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms, suggesting a phishing or malware distribution attempt. The PDF's structure and embedded content indicate it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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.
  • 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://equalland.com/uploads/File/bibomojo.pdf In PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/9891734423.pdfIn PDF document text
    • http://syekp.gr/sites/default/files/file/lefiwobegituzufo.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021091606235380554.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/59506599776.pdfIn PDF document text
    • https://matrixx.lu/images/64383649281.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/2a992c541d44ae322fcb086d2fbe9209/rabuwafubadarorozozupog.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/sevexivukomaxati.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/4385115063.pdfIn PDF document text
    • http://phuongsen.com/img-chamthi/files/ranubusoleg.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rivikezosezagifoburipi.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/51682372405.pdfIn PDF document text
    • http://atya.eu/files/file/simojo.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355e62de758---gojuzerak.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/xosul.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/24560839252.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/kisebizagife.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/71455068049.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/34924659032.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/15481319352.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/gikigagesajotopa.pdfIn PDF document text
    • http://billsky.ee/files/file/dazefufezud.pdfIn PDF document text
    • https://combrooncom.com/contents/files/mekanugowek.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/64489179588.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/12123958859.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=android+button+press+animationPDF 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_off0000b2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BD 10728 bytes
SHA-256: 1ebcef5879ce8d369d78e322e9cc9588b358969384c0391d8dbb31aba46dad79
font_01_sfnt_off0000cb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB24 14832 bytes
SHA-256: 131886472d9a31e15f2629a7abf593d3c84a82537c8625d14f0a7ae47933b403
font_02_sfnt_off0000f0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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