Malicious PDF — malware analysis report

Static analysis result for SHA-256 40638412b205ad80…

MALICIOUS

PDF

68.3 KB Created: 2021-09-25 11:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0aad08a6ff717b50c04c8a1d85da1b44 SHA-1: 16e0b44e9a52f9f01d95f042bb797c0a2e7331f4 SHA-256: 40638412b205ad80a403965a8e9383253559facabe0424212304357bbf74fe48
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to distribute malicious content through a large number of small, disposable PDFs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://aspirans.com/files/file/wapinilotetataso.pdf In PDF document text
    • http://khacvietlaser.vn/public/images_news/files/14674826444.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/vanivezagipevedilaj.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/75321346892.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/mekusejuxumiwe.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210909_9065CD50F3DE041A.pdfIn PDF document text
    • https://newoptic.sas-global.mn/uploads/files/42051862268.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/55950441790.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/lazoponelebifixutoduw.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/palimanabufusalikes.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/kewizawozadadofuwuto.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/pojubobokimomewog.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/84197684854.pdfIn PDF document text
    • https://kermanrooz.com/img/files/vumiguvifalilabo.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/tebedejetadimuzazewerek.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210918183624_vhgulw.pdfIn PDF document text
    • http://portableandcool.com/files/files/warej.pdfIn PDF document text
    • https://pr-dienst.ch/file/14451195587.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/boranopijejena.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/xamojaxejogoniv.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/72507424454.pdfIn PDF document text
    • http://xtra360.net/campannas/file/nuritamajilinefaz.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/juwum.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/19178208236.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/divabivoborawub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=steam+gift+card+redeem+freePDF link annotation
    • 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_off0000af39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF39 14672 bytes
SHA-256: 4949a08e232e08615ace5082736d751d0f9281b472b67a3fb7180414d8c12fe7
font_01_sfnt_off0000d41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC34 10456 bytes
SHA-256: 6d576fb9d7508d35170a8a89edc638ca47b1a126acf73097184bdb8483bfbf7e

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