Malicious PDF — malware analysis report

Static analysis result for SHA-256 469233f272a16f4d…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 05:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1dd4c595d0670686ba5569d285e5cfa6 SHA-1: 98a92125f88da840820f7575ea7169207f8229eb SHA-256: 469233f272a16f4ddb1f8a7664adf1853dc06892b4d0f7051dd9ce9509400a3f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and utilize UTM parameters, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is designed as a link farm on potentially untrusted domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://infrive.ru/uplcv?utm_term=the+kissing+booth+movie+download+free
    • http://storemisr.com/uploads/files/45858205016.pdf
    • http://mkpstroitel.ru/upload/files/10111322218.pdf
    • http://erbaytag.com/resimler/files/gasasigepalim.pdf
    • http://tubietelbar.hu/uploadfile/bejizopafokofireveg.pdf
    • https://kapefashion.com/files/files/65562397810.pdf
    • http://nato-denkmal.de/uploads/file/1617271417.pdf
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210905000326.pdf
    • https://daquin-ferriere.fr/userfiles/file/jezafatixekuxirejisi.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/4cd4cca4eaec87ec3ecdeee61312bcbb/revosimukiwemuminel.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a6bfc3415---90179965259.pdf
    • http://ecole-belair.com/ecole/file/13409827280.pdf
    • http://ntvietnga.com/upload/files/25596491459.pdf
    • http://lnyuanzong.com/uploads/files/20210923140813.pdf
    • http://www.ufolep-69.com/contenus/files/terilodavezivo.pdf
    • http://enricobarraco.com/files/sasopufomi.pdf
    • http://udmvdpo.ru/images/files/80464576705.pdf
    • http://topenglish.sk/app/webroot/gallery/files/zeziw.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109221411553281.pdf
    • https://serviceelectric.ca/userfiles/file/mupibokopukulovarem.pdf
    • https://snoman.mb.ca/ckfinder/userfiles/files/tagemuwukebef.pdf
    • http://daearesort.com/FileData/ckfinder/files/20210914_ED67AD07A4B34AA3.pdf
    • http://studio-orlandini.com/userfiles/files/lasenivaxejuver.pdf
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/mojesivasowebegevegi.pdf
    • http://www.moyekolodin.com/files/rajuwevawot.pdf
    • http://avvocato-callegaro.it/public/file/tewekikaf.pdf
    • http://clickvay.com/upload/files/45532545824.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_off0000b148.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB148 16792 bytes
font_01_sfnt_off0000c95a.bin
3b4afe811374405e5bed302c893e2ccf1b6f248add2fbe06f07b705616ea6001		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC95A 14724 bytes
font_02_sfnt_off0000ee7e.bin
768076f3d9517aa0e661d87a06cebb39349f796ee3566f4103ffd292a044ffac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7E 11148 bytes

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