Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a6beb6d7edc14b…

MALICIOUS

PDF

81.4 KB Created: 2021-09-13 05:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 17935ac4c251adc71602571e8750a236 SHA-1: de98729a2be817f2cc3d01854ce7864c2d0ab613 SHA-256: b3a6beb6d7edc14b0d1c74956bdc48cfd98ed67f763a07c48edd4009cb1481cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a malicious intent to distribute links, likely for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crysiq.ru/uplcv?utm_term=ppsspp+apk+2019
    • https://eniedu.com/data/file/20210909042645.pdf
    • http://tnslib.net/userfiles/files/jujedagilubopus.pdf
    • http://wxdyzs.com/userfiles/files/suwetigovunidazorukesowew.pdf
    • https://abbma.in/admin/uploads/file/57339857427.pdf
    • http://ville-dammarie.com/ckfinder/userfiles/files/jitabawejig.pdf
    • https://superpackeg.com/userfiles/file/tenuvonazabepunovatefasu.pdf
    • http://damutech.kz/upload/2021/09files/210902155243877230covba.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/chdefl1ap07ofk26u4uln07l40/21329362824.pdf
    • https://speakingparrot.com/upload/ckfinder/files/64295494189.pdf
    • http://changrung.com/ckfinder/userfiles/files/lovimetegulerudiwakegafun.pdf
    • http://soosanfix.com/upload/fckeditor/file/30273201604.pdf
    • http://stl-hk.net/userfiles/44296353766.pdf
    • https://beysukonaklari.com/ckfinder/userfiles/files/18423513231.pdf
    • http://www.enfersalus.com/ckfinder/userfiles/files/faxosotek.pdf
    • https://alihuata.com/userfiles/file/6046623260.pdf
    • http://geombiagioschettino.eu/userfiles/files/93775752035.pdf
    • http://sinoorchids.com/image/file/zirojajidebedak.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613161a707bd8---17259538077.pdf
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/50980272353.pdf
    • http://blueview.nl/app/webroot/files/userfiles/files/wugujegepebol.pdf
    • http://kelsenator.com/userimages/45363217399.pdf
    • http://www.fred-robin.com/ckfinder/userfiles/files/wopenunisikoz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da5d.bin
4eb7e46a64ef92a0b403870fb090bcbe5ff6bc3801e91581f72c9dfa1a02d98f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5D 18064 bytes
font_01_sfnt_off00010933.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10933 16792 bytes
font_02_sfnt_off0001214a.bin
1068db8dcbdaf15e82b2a8b4e5242a51c7b4d9e9b8b06745e16b012d76ec61d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1214A 10108 bytes

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