Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b81506b6afb66d…

MALICIOUS

PDF

80.2 KB Created: 2021-09-24 04:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7707aaac7d758cc5e97d50ab96d98765 SHA-1: c13f21c0cdeebda19f96c58d6bfbf41de7879786 SHA-256: b8b81506b6afb66da079ec25ab64e39fb56435d57c9a267b0418e9be2c31bef2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest an attempt to distribute or host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://maslatalaia.com/userfiles/file/ridijejifezogivoze.pdf
    • https://stw-nowogard.pl/download/file/zabef.pdf
    • http://merrygoldholidays.com/ckfinder/userfiles/files/85487336279.pdf
    • http://suranareecommand.net/UserFiles/File/jarolanatajerededu.pdf
    • http://technoauto.jp/js/upload/files/pavogupanibimenisaw.pdf
    • https://pingthye.com/userfiles/files/wiraxuxav.pdf
    • https://lazdynumokykla.lt/userfiles/file/68349507042.pdf
    • http://aeusjtu.pretty-match.com/upload/files/38158973038.pdf
    • http://gaziogluenerji.com/images_upload/files/32493977320.pdf
    • http://ambulanceservice.pl/userfiles/file/xinetumaxigagiwo.pdf
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/badenivonajezipenamexa.pdf
    • http://edins.net/userData/ebizro_board/file/55596942183.pdf
    • http://pnalog.ru/images/file/sasemoxajojudefaban.pdf
    • https://istanajp.com/contents/files/kejipimenikaruparoxix.pdf
    • http://domosplast.hu/files/file/54501910634.pdf
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47779450644.pdf
    • http://mbeautyconcept.com/upload/content_images/file/17330217139.pdf
    • https://panama4d.com/contents/files/49562312829.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/fd5c3a4e74bea139f4c3498be73cfb32/tiribotovumaxikagakugug.pdf
    • https://jpjplumbingandheating.com/FCKeditor/file/repagelikadisomusu.pdf
    • http://kubabus.cz/novy-web/upload/file/61283578550.pdf
    • http://megat.pl/uploaded/fck_files/file/buwumu.pdf
    • http://vatlieulamnha.com/media/ftp/file/kiwapisejobijirilunenek.pdf
    • http://zhuoxinlaw.com/userfiles/file/20210921053238_1246464159.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=cara+download+aplikasi+dari+google+play+store+di+komputer
    • 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_off0000d7a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A6 16792 bytes
font_01_sfnt_off0000efb8.bin
23447cc5dcd00dc6e2ec3239ab5562aed273e38f8896e1c76fdd47d23ad546bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB8 15880 bytes
font_02_sfnt_off0001189b.bin
e93472c5cd77080cb25892fe184141ae21f553d68a03de2b201cee2dfc2d178c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1189B 11160 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.