Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d90664e290c2031…

MALICIOUS

PDF

79.8 KB Created: 2021-09-13 07:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 100da2647f1bd4d8178a98532319d87f SHA-1: a67f4ec5bd4d4f6e01157a00c1b50ba118db4909 SHA-256: 4d90664e290c203186f9074d5f5ff29ff89ca2887a7818041b55177d91458d3b
142 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Embedded JavaScript actions and external URI references indicate the document's intent is to redirect users to potentially harmful websites. The presence of numerous links, many on disposable hosting, further supports a malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=livu+hack+apk
    • https://www.agencesramos.com/ckfinder/userfiles/files/jafan.pdf
    • http://mimarkamilozkartal.com/userfiles/files/dazujojokiwalomomisaxede.pdf
    • http://fotografiafrancescosomma.com/userfiles/files/39310129634.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/07b4bcd253dbe95fc091865dd0d3369a/45060587109.pdf
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/dulonitaxawijofozitivi.pdf
    • http://linyuepharm.com/upload/files/bapeziwatorulabiju.pdf
    • http://srividyaastrology.com/userfiles/file/37037006100.pdf
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/jupalorufoziwewisoburajek.pdf
    • http://on-video.com/movies/movie_data/file/wupukojinujeremopaka.pdf
    • http://elsped.hu/files/file/rifajosarivavadikanilifut.pdf
    • https://fivetc.net/uploads/files/70031386472.pdf
    • http://ducnhua.com/upload/files/9038526897.pdf
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sutixo.pdf
    • http://dajuicebarus.com/uploads/files/84938674924.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130f89247c38---guberezuta.pdf
    • http://biomehl.com/images/content/files/5662950483.pdf
    • https://theshamrockpublecco.it/file/2006849065.pdf
    • http://tutek.eu/userfiles/file/38055741393.pdf
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/bebijubexosefonowexetorav.pdf
    • https://cnn-logistics.com/asset/files/tugoviwumitekapatavo.pdf
    • http://qcfloor.com/userfiles/file/83709564429.pdf
    • http://pandoraecza.com/genelresimler/file/venitojoxelesuvukejudal.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_off0000cd28.bin
b87ea4cd6054164b8a71d2ed03a564e8c4e5c4ab13429b0f10f059900efa3662		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD28 9916 bytes
font_01_sfnt_off0000e32c.bin
c94e1453af5c4cee8f97e265fdb699f9f475b7aa9722489792bb4939e406a8f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE32C 21888 bytes
font_02_sfnt_off00011a3e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3E 16792 bytes

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