Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfde1fbf198f68e4…

MALICIOUS

PDF

70.2 KB Created: 2021-09-17 10:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 55fa9518b6048b22855f1f59c4326700 SHA-1: cc8c12844f47f668bf8e83d28d86050df2d14503 SHA-256: bfde1fbf198f68e4b07070d8059bb3b3bd9d6126c0421fa6bab873a9e536707a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vegman-kzn.com/ckfinder/userfiles/files/nekidupuw.pdf In PDF document text
    • http://wx-test.com/upload/ckimg/files/202109161754239012.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/55338383997.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/juwakemawibixuvedit.pdfIn PDF document text
    • http://steinemann-ag.ru/xokezofade.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/58487257652.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/suzerol.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109082353057816.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/49838274667.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/93917400710.pdfIn PDF document text
    • http://www.moyekolodin.com/files/lizawubuwazuz.pdfIn PDF document text
    • https://partetesal.ir/data/file/39906609047.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/zawuxovalus.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/13485309952.pdfIn PDF document text
    • http://lawngo.net/fckfiles/93399520840.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/48430647514.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/61913091693.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/95476737107.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/67202783712.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/99069314187.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/58856495852.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/10431095299.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/wusikurosexejezuminad.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/20dc4cb67441f3c36df61f86ddecd6b2/16581924724.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=diggy%27s+adventure+energyPDF 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_off0000b400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB400 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC12 15284 bytes
SHA-256: 506b1bccfcc6157e3109c54eccad3c2ba1fffcc0d136e37b0ac7851a6b212513
font_02_sfnt_off0000f29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29C 10572 bytes
SHA-256: d50a1198052dd9a1b6b6c81852d80105c3cbcf09237d4cc5737fc505a4a57de4

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