Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f91ba15fde92e1…

MALICIOUS

PDF

71.2 KB Created: 2021-09-26 04:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c7c3a4b6cb3db54803a97d715dadd58 SHA-1: f47d956f870426aa3a084904c7258792fc7af21c SHA-256: e8f91ba15fde92e15516c9561c0584ea33665bfe05b5a2e6b8bafcc2fc55d063
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs pointing to various domains, many of which are hosted on disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

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://coretry.ru/uplcv?utm_term=which+of+the+following+elements+is+a+metalloid
    • https://bangvetthuong.com/luutru/files/tuteteponetufebulinar.pdf
    • http://glamour-nsk.ru/ckfinder/userfiles/files/xebufoxezovuxajokawa.pdf
    • https://cosplay-expo.it/ckfinder/userfiles/files/tabesitiwaferofegenosituw.pdf
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/61719738013.pdf
    • http://malopolskiszlakwinny.pl/upload/File/debolewivituja.pdf
    • https://ladymamashop.com/uploads/files/202109100907124346.pdf
    • http://www.azurwelcomeservices.com/userfiles/file/sopilawekogi.pdf
    • http://www.psoealora.es/ckfinder/userfiles/files/lovole.pdf
    • http://fli.edu.mn/ckfinder/userfiles/files/gadipageku.pdf
    • https://euinsuti.ro/app/webroot/files/userfiles/files/68442735668.pdf
    • https://washlounge.in/ckfinder/userfiles/files/4435645840.pdf
    • https://cyberbirddog.com/userfiles/files/gaxixoleg.pdf
    • http://www.sanjuktabanerjee.com/fckimages/file/61208175305.pdf
    • https://olivermilk.vn/tctt/sites/aaa/file/voxit.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdc8bde936---92422890534.pdf
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bemevareri.pdf
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/mowukolarojapifivawe.pdf
    • http://1night2daytour.com/ckupload/files/korusenafexonaxekav.pdf
    • https://ecoverservice.be/gallery/file/5690024177.pdf
    • http://zaiger.ru/img/file/vokibawipan.pdf
    • http://lapempi.nl/ckfinder/userfiles/files/96929660708.pdf
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/8243401650.pdf
    • https://demetraproject.eu/ckfinder/userfiles/files/92530411698.pdf
    • https://zaindu.drogomedia.com/files/galeria/files/norapapuluvofisilutode.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_off0000b1e0.bin
76740772c9e8ca481cbe391f4c942c8a2f9bcca8234caf5c7ae9704b24aea75c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E0 17224 bytes
font_01_sfnt_off0000de1d.bin
7b35638cc6fdc2df4b99d5192edd51fa67f3515297328f6cce1244a8d4e05d93		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1D 10904 bytes
font_02_sfnt_off0000f706.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF706 16792 bytes

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