Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb477f6cf01960a…

MALICIOUS

PDF

71.9 KB Created: 2021-09-10 11:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e2a48f5fa27eed6c968ed234d52afd33 SHA-1: 2d706a4a88c48a0a1be2271b825a400c66702491 SHA-256: 7cb477f6cf01960ab034514bcc29926c714f7110de6dd44e8211a2baa22da6f0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, and a heuristic identified it as a link farm. 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 delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://garnizone.com/userfiles/file/51773658.pdf In PDF document text
    • http://kripasec.com/userfiles/file/jufavokoxumigo.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/hf7ege53rcgdc2pc76dg8t3t6n/5574198460.pdfIn PDF document text
    • http://master-br.ru/img/file/xevisepel.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/juvuwawirojegilumirelezen.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/vakabonar.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/xuxibemapixilub.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/41687446425.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/28006809790.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/nogifufop.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/13095639113.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/98253767167.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324dd8559b2---jipokudajifi.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021090815031170554.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/26194230112.pdfIn PDF document text
    • https://efnnma.org/files/file/42546098653.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/16172641974.pdfIn PDF document text
    • http://afro-safari.com/upload/files/motibudu.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210901180414.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/91611685903.pdfIn PDF document text
    • https://superchills.com/userfiles/file/81648322956.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/13658240139.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///bibarewisebobepo.pdfIn PDF document text
    • https://marbletreasures.com/uploads/image/files/84761989508.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=lingua+latina+exercitia+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_off0000b549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB549 17152 bytes
SHA-256: 3e035eacdb74637284701ec8f9cbdc7dc5c9d6af8768a5de801fdfa3db77eade
font_01_sfnt_off0000e1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FA 10664 bytes
SHA-256: b5053289893f2ef11c5195f358e3fd9d8b9a1ee95e35483838b9be2057750c28
font_02_sfnt_off0000fa55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1