Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff591e79692a7fe…

MALICIOUS

PDF

67.2 KB Created: 2021-09-20 01:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bb16d71da6fdd464c1e127df014f9638 SHA-1: c358a0b12594483c8dfee7a36e120c7494db87b2 SHA-256: fff591e79692a7fe077f3c197075ee2d714e6414fe5837c142592f0f6751b1aa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external sites, suggesting a link farm or redirection mechanism to deliver malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit vulnerabilities or trick users into visiting potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://kortennis.co.kr/B/ck/ckfinder/userfiles/files/76150693521.pdf In PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/losijuzakokifatenefig.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/romotukutawususizid.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/24296363665.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/40821898948.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/80794685642.pdfIn PDF document text
    • http://irths.com/upload_files/files/vuwozavabimurodegud.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/46315653375.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/75464915335.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/xufimuxawofulomewufirener.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/pesapakexesaranubupimev.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/nonigebotijuwasotiz.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/kawujoniguxozagawaxe.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16146f3a6f249c---jodojumudaworekunipovide.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/85935706259.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/wepoda.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/rewaduripedavekilumozi.pdfIn PDF document text
    • http://pentas.eu/userfiles/file/rewazajuxatixomuman.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/18502438149.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/70247995105.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/55268185546.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=torrentvilla+movie+download+appPDF 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_off0000abb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABB5 14408 bytes
SHA-256: 4f7584bdce6eb13a7af403dc5c57817077ec80b81e202348fd552dd6a56b9376
font_01_sfnt_off0000cf98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF98 10500 bytes
SHA-256: 06994b8a801c9c567194fbea313fcfcb7d80574bf9c4a8ccff9d897881157f4d
font_02_sfnt_off0000e777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE777 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1