Malicious PDF — malware analysis report

Static analysis result for SHA-256 b50f041410721c6c…

MALICIOUS

PDF

69.1 KB Created: 2021-09-28 11:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ac64573bfdcadc2c2094ce52aed63929 SHA-1: df8f85e55cb17ec6ec7d90ee353f266db138a456 SHA-256: b50f041410721c6ce3716a2c571be6083c8dc8470c4d3c76f44b7884ab856305
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://aldobini.it/userfiles/files/2566672845.pdf In PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/gotutimimi.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/30768140409.pdfIn PDF document text
    • https://wmu24.ru/media/file/48000899482.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/26339731298.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/82169436205.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/96227196507.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/7437012631.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/mowidugajovederevot.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/lazuwodutaburujexejutu.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/ziniwiseporerekojix.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/jekekaxotavin.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/noximonisixefunata.pdfIn PDF document text
    • http://minhanh.com/files/25914632762.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/gebuvasutewat.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/fadodenilujavakavule.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/16449110189.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/nudetur.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/96579780193.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/wumofeguberuki.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/jogemo.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/wusugeposuwodajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=android+con+apariencia+de+iphonePDF 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_off0000af77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC789 15828 bytes
SHA-256: 9d40d9a4fbd0b4a31cc90c5acc11d93c490aa7fa3bb50c7010b8d4f5773b33d0
font_02_sfnt_off0000efee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEE 10280 bytes
SHA-256: 81ba54e8a05cb827e9ba572019be256313e7d2c2225a2b57ab376bd3a7dac1c9

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