Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc3486a0b487b9e…

MALICIOUS

PDF

99.1 KB Created: 2021-09-08 21:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3e15337b58079d90a7ee3d6e26b5076b SHA-1: 74b367814265c1adc4bcf649496d2d56204620b3 SHA-256: 5fc3486a0b487b9e895f0741fee9a2d6d2b6cf05e2c64e904dcc59559c0c2eda
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm designed to obscure the final destination. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest it is designed to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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 http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613642b1cee20---xamejepumigudelupaxe.pdf In PDF document text
    • https://chungangroup.com/uploads/files/202109051138426044.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/81773845067.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/82373353503.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/mutaxolugivaxavirejofawil.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/fopesokomumusi.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/55437909704.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613127cc5317c---nanakizivebojaforazi.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/moxapilimajobugi.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/83672037211.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/balevopijerefa.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/31848102480.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/36257449877.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/27191192129.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/70749908709.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/61308486558.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/dagazikukelozopuluj.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/bibemedufo.pdfIn PDF document text
    • http://signauction.net/userfiles/file/lupexiguxibipexubovojat.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/duriwosuj.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/gomatugejozi.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/waluforubinukixasazus.pdfIn PDF document text
    • http://platcometals.com/images/file/zeloxenirolaferumivadop.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/vuvefewoxajufogafazuragop.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/24160844582.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/tebatujemabugotore.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=lullaby+of+birdland+partition+piano+pdfPDF 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_off0001171c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2E 21048 bytes
SHA-256: cf1a4024da311ff6597fcd496b0cb734a12fc6488a3880a72997abfe22de54cd
font_02_sfnt_off000166a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166A4 10504 bytes
SHA-256: 969b465d14db8e7ce693d70df8db031e2024500a969e68862d2d80218bac9d32