Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0ca6d5e273d8ff1…

MALICIOUS

PDF

79.7 KB Created: 2021-10-13 13:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b927319a57bd457470b5b1e8a8424d50 SHA-1: 409c2c7ee9dcf2798caf9744119e8aaa4f99314c SHA-256: d0ca6d5e273d8ff1210dc66d9f2bea1ac4b73c614618230727b65b0cbda9041a
126 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous embedded URLs, many pointing to suspicious domains, and exhibits characteristics of a link farm. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to potentially harmful content, aligning with phishing and malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://skl.deindrukdemo.nl/upload/files/96021323595.pdf In PDF document text
    • https://appvid.eus/userfiles/files/viwafugaxujigexusezavijal.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202110080710343424.pdfIn PDF document text
    • http://rem-proekt.com/f/file/tusogurijewuzenovoximoxi.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/mirebodilera.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/budazatolefikuzujum.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/virowotikide.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/92299136888.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/xowole.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/72751387792.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/29/juxutozixupulusovijo.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/kokerijusebunaxeme.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5ae835a42---67480419770.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/papori.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/sobason.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/45114101622.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b463238de---52132894681.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/mofikimaze.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/58191517532.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/mofujukuduma.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/tuxumitanaxuwagaga.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/2I9n2o-U8HI/uplcv?utm_term=free+textbook+linkPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210907/16309843781178.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_off0000d394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD394 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAB 10080 bytes
SHA-256: dfa911d0bdccf0bea3380156730620d0a4a4f3e37d6e902995fb50386505527c
font_02_sfnt_off00010228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10228 18376 bytes
SHA-256: 5582196d76dbc0c4000d861fa1301a7f9253a5659880776b8d7943f66636f688

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