Malicious PDF — malware analysis report

Static analysis result for SHA-256 29f40558861ae467…

MALICIOUS

PDF

82.2 KB Created: 2021-10-05 18:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 81d6c974c1a5395a349c5768d890af32 SHA-1: 564bd8ded2b41b3362d81fcbb240d223fdce9b35 SHA-256: 29f40558861ae4674a7e5b0ea287ce521309fc2e33d8ca543d564c78a552665e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojanized PDF. It contains numerous embedded URLs, many of which are on disposable hosting and appear to be part of a link farm, suggesting a phishing lure. The PDF structure and embedded content are consistent with attempts to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://medvor.ru/uplcv?utm_term=do+let+it+go PDF link annotation
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1612fba4001024---pokodebatesek.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/99601317501.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/54358312428.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/49921974896.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/94860069173.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/gexukoz.pdfIn PDF document text
    • http://hanleyresources.com/images/9311492924.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/xadepalixawep.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021092214220173499.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/kutajaxupekulijevoba.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614feed82629a---luwiwulaze.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/radep.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/wiserirojopof.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/sojixabobitategowoxedi.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/10469724655.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/juwalufaxavisaxejil.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210916003438.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/30717167381.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/15164348408.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/50846034166.pdfIn PDF document text
    • https://bunianco.com/other_files/File/tunupaxovuju.pdfIn PDF document text
    • http://doxetrilinh.com/media/ftp/file/gozaniwemotozibapuviken.pdfIn PDF document text
    • http://ktcz.eu/files/files/50139733913.pdfIn PDF document text
    • https://totounited.com/contents/files/27885132966.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD929 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13B 20492 bytes
SHA-256: e194efd2b5100ea8892af5982beafbfd9d93881e834bdd80582c03a7f0ca666d
font_02_sfnt_off0001263f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263F 9748 bytes
SHA-256: 272f30a82b8d76f12b7e193d5eec3a588b741f1928a6b6f694d74843d655b1d8

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