Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe9488ca64130d1d…

MALICIOUS

PDF

86.1 KB Created: 2021-09-12 08:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b2e0ea3409a3e9de91e83a0531933129 SHA-1: 33e63c71888e4c81a2e50565941c6aad60e06074 SHA-256: fe9488ca64130d1dc01a1ddef8826af4941005999ef38e694937be2dc665c11d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as a phishing trojan and a machine learning model indicated a high probability of maliciousness. The document contains numerous embedded links, many pointing to unknown or potentially malicious domains, suggesting a phishing or malware distribution attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm designed for SEO manipulation or traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nedimgame.net/calisma2/files/uploads/boxonakona.pdf In PDF document text
    • http://beming.com/ressource/site-image/files/favekuwamulir.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4137432447.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/sulodirofitisoloxi.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/bagejovuker.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/rawepagupage.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/72738226292.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/22200638661.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/vunomegonalabamexi.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/91302541911.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/biparimofekutefopizu.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/dejezixitowofilivunego.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/nuveseraf.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/50835888847.pdfIn PDF document text
    • http://shardamedicalstore.com/singhania/downloads/file/20300104231.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/wajugujanev.pdfIn PDF document text
    • http://iscelenie.info/files/file/tubibopokorupizasisadujog.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/85924080637.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/72723164830.pdfIn PDF document text
    • http://geasit.it/userfiles/files/nupogekotewedojetanozir.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/nosopevobif.pdfIn PDF document text
    • http://philipsphotographystudio.com/nidukitufavebevojuze.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2ac86d65e---73832656839.pdfIn PDF document text
    • http://esistore.de/userfiles/file/96821308739.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=win+iphone+for+free+onlinePDF 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_off0000ecc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC3 18432 bytes
SHA-256: b43ba5a34e9e3631e68693931fb05b10037f84b4cc1c29bb68f42fa8fd2534b2
font_01_sfnt_off00011cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C9 10020 bytes
SHA-256: b68d1da606d9595fd662743e74343d5e427353c071eb668791120d0bd4670bdb