Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e329b87cf47fd28…

MALICIOUS

PDF

76.1 KB Created: 2021-09-23 15:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3aca4e8bda57564f3ef5b5a40a3c8552 SHA-1: dfff80e5a41f5969b4911988ad2a6f65c80281e8 SHA-256: 4e329b87cf47fd28a62a56af089ed27425f03cb85b6228a4264b395bd7f4ebbd
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially malicious domains or are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://adamlegal.com/userfiles/file/fuferere.pdf
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/xavipebuloxal.pdf
    • http://www.hangmandigital.com/files/file/zulujimonorolid.pdf
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/zulatesepudugoxa.pdf
    • https://angkoronetour.com/userfiles/file/lutobagupivejofadaxeb.pdf
    • https://ikomsolutions.com/admin/userfiles/file/xuxezoxaxejex.pdf
    • https://institut-arabe.org/ckfinder/userfiles/files/98445893767.pdf
    • https://ghnservizi.com/file/jigopanijokoredad.pdf
    • https://558com.vegner.com/userfiles/files/20210919_090444.pdf
    • https://jokerprod.net/userfiles/file/xezujaboxaxiwefilaruwoj.pdf
    • http://wuchem.com/upload/files/gudezawis.pdf
    • https://alajuusa.ee/media/contents/file/filatuzunejegesode.pdf
    • http://yugang360.com/upload_fck/file/2021-9-5/20210905002512780264.pdf
    • https://megatex.ua/images/uploads/file/40553940288.pdf
    • https://equalitas.es/userfiles/file/dagevefulosiduxifetap.pdf
    • http://cleangroupbd.com/ck/upload/files/41938563014.pdf
    • https://marcuspietrek.de/MARCUS/files/file/joxovotogikiv.pdf
    • http://wccflooring.com/userfiles/files/nuvavipulinu.pdf
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/takavofurepivapupozekaz.pdf
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wubuvavibudotovotogij.pdf
    • http://novena99.com/uploads/files/202109170024106706.pdf
    • http://wo-kop.pl/userfiles/file/wojovoguzidagese.pdf
    • http://xinghui.co/upload/ckimg/files/202109090745488808.pdf
    • http://www.aamuhsv-madisonalumni.org/files/files/13621101989.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421c3bb5c6f---senuvutup.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef08044267---gilemimadulemozorabukef.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=360+video+metadata+app+android
    • 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_off0000c4dd.bin
00d57028f41d0ef79a1cfb7cc712d3f41001999885f0664e9c414c51615bd17c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DD 10772 bytes
font_01_sfnt_off0000dd9d.bin
10c41d0b363a5e4d2429fa56e5db052c175ecf6f370e91aa55c8c48c526fb4d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9D 16764 bytes
font_02_sfnt_off00010900.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10900 16792 bytes

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