Malicious PDF — malware analysis report

Static analysis result for SHA-256 22827ef0f5dfccba…

MALICIOUS

PDF

74.4 KB Created: 2021-09-17 12:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 840b2fc6a2027203c8dccfdc6ad18c90 SHA-1: 91c43fbba7bd8f1dec58b68ff2f2f4d8f47ee8cc SHA-256: 22827ef0f5dfccba74fec1ab308606402260fc479605bee088be3a7b44c5d4d7
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous distinct URLs, many pointing to PDF files on disposable hosting, indicates a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://toananhmedical.com/uploads/files/68735352683.pdf
    • http://salukool.ee/upload/userfiles/file/paveti.pdf
    • http://gzwep.com/img/file/202196213723.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a529df247---fajepopojexokek.pdf
    • http://abnigakgdsg.friendship-match.com/upload/files/30635991437.pdf
    • https://skillmapmagazine.com/ckfinder/userfiles/files/68605950473.pdf
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/wosuta.pdf
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/66817225935.pdf
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/radovugudonime.pdf
    • http://liyangah.com/Upload/file/nitiguxap.pdf
    • http://civicwomen.com/ckfiles/files/19063175551.pdf
    • http://esrafisek.com/images_upload/files/sepiwaxedimu.pdf
    • http://accronline.com/userfiles/file/pizosatutuxanedovobuxi.pdf
    • https://weilaimachinery.com/userfiles/files/32555820245.pdf
    • http://liga-stf.ru/i/upload/files/kinekisisagavipofawejib.pdf
    • http://ave-france.com/pics/files/parabaditowokozuborijenu.pdf
    • http://narcisse.sk/editor_uploads/files/rifiwedimesibujone.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/1d2ff68aebd2fedd2bd06d00f6234aa1/92865269868.pdf
    • https://zlatartopalovic.rs/files/98306355291.pdf
    • http://cmcthailand.com/ckfinder/userfiles/files/ledetonosineg.pdf
    • http://khautrangkhangviet.com/upload/img/files/xikerasuxe.pdf
    • http://wawa757.com/uploads/files/puzuwowuso.pdf
    • https://bhsbeacon.com/FCKeditor/file/51677586881.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=awaz+changer+app
    • 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_off0000be5b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE5B 16792 bytes
font_01_sfnt_off0000d66d.bin
284d6bc9103d931071fd97eee054ea6e483a1d63ab9b38013c6ceb962970f03a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD66D 18880 bytes
font_02_sfnt_off000104e9.bin
1e47efbaf6a1e22ab99a967d978cd4c58561ebe5956d9c1e0342438102f4676c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104E9 10256 bytes

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