Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c5f3cf034a02953…

MALICIOUS

PDF

71.8 KB Created: 2021-09-19 01:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab2b82b1fbfc6ae61cb68681ea743d58 SHA-1: 5d7b8d514ac55ffaae069e704042c8ed9bc79efe SHA-256: 1c5f3cf034a02953eaec2717d239ab53ba69e56437cf25a869cffdaa1291d1be
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the document is part of a scheme to host many links on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://queure.ru/uplcv?utm_term=air+attack+android+game
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/36a91ccdef36f2cc022225e61973257e/vipedurer.pdf
    • http://hoangnamjsc.com/upload/files/dixufeketalamemififuror.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140da4484801---nejonunagevifa.pdf
    • http://nowyhotelik.pl/userfiles/file/81583644675.pdf
    • https://olboihorgaszto.hu/editor_up2/muloli.pdf
    • http://an-professional.ru/img/files/file/vufare.pdf
    • https://lescourailleurs.com/upload/editor/file/23641722675.pdf
    • http://jimsclub.net/new/board/img_tinfo/file/20210904184815.pdf
    • https://kingyao.com/uploadfiles/files/20210909_223259_7510.pdf
    • http://optimaglobal.net/ckupload/files/8117310763.pdf
    • https://mraos.com/web/userfiles/file/favomisogomuwebezopi.pdf
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/16627608334.pdf
    • https://flims.atelierleuthold.ch/userfiles/files/fatimuzowoboguda.pdf
    • https://lerivagedesmilleetangs.com/caningest/images/file/76905639444.pdf
    • http://zatuchlina.cz/upload/file/webomirovadewukugezawoz.pdf
    • https://phongkhamtamthan.net/uploadeditor/files/14169864864.pdf
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/92297335470.pdf
    • https://valergences.fr/userfiles/file/rumidagoradugimixojik.pdf
    • http://pecsimutargygaleria.hu/files/file/kajidasomafo.pdf
    • http://yingtailong.com/upload/file/210919052012910030j6ltc6rgyoyt.pdf
    • http://madveras.com/ckfinder/userfiles/files/85218896402.pdf
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/fexixodubuminigusemin.pdf
    • https://vhssirimpanam.org/ckfinder/userfiles/files/35464966797.pdf
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/37874451746.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_off0000b2dc.bin
e5634edc4fcbd4aefc45cfbf431405d89a7abb9addcac6915c618bbb1cce3e02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DC 10572 bytes
font_01_sfnt_off0000cacc.bin
43180844bd5988f7a56533813bd6189250dc4a1544b6d617ab406f7cee7f8993		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCACC 18144 bytes
font_02_sfnt_off0000f9ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EF 16792 bytes

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