Malicious PDF — malware analysis report

Static analysis result for SHA-256 9454627e6ddabc9c…

MALICIOUS

PDF

70.4 KB Created: 2021-09-28 02:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3b21492fabccf3d0b6c5ceb201f83f63 SHA-1: 3289124eefd186589829a0f47f1cbd4a9fad5a5e SHA-256: 9454627e6ddabc9c52be8d5ed8d97776fd40a47f61ee89b7ca7aa9e5d840486f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of numerous embedded URLs, many on disposable hosting, suggests a link farm designed to redirect users to potentially malicious content, consistent with phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest an attempt to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://crysiq.ru/uplcv?utm_term=a+game+of+thrones+online+pdf PDF link annotation
    • http://neza.cz/UserFiles/File/61512154500.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/48038830198.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/betomesawo.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210916080925.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7ad1df08f---28351736412.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/wudex.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/jusobovovudore.pdfIn PDF document text
    • https://semut73.com/contents/files/59076943521.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-18/20210918075901675153.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/72228732888.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/55598441017.pdfIn PDF document text
    • http://cx-gl.hu/images/files/vezixemixenapomimobi.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/63615648435.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/92937836839.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/87840779130.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/vebekiliwofopisewidizew.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/23150345810.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16148fdd1243d4---lefarilivasetofuga.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/botopubunalekeliwaraji.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/63203225440.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/35685397222.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/66162250907.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/segemudunamaze.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/64394581389.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/848037994.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/40993644826.pdfIn PDF document text
    • http://neteyes.eu/editor_up/fevudirodizadorutuwov.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/lebirorali.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_off0000b36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36F 10928 bytes
SHA-256: dfdabbac51a2f8918de74a9db9fdb5e589d7b25f93d689ba530564ef40947503
font_01_sfnt_off0000cc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4B 15416 bytes
SHA-256: 6978fac237182131b104fd7624bf8acb39dfdecb491b53e04e702b55852a3670
font_02_sfnt_off0000f3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1