Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c9ce3c18bddc2d9…

MALICIOUS

PDF

85.6 KB Created: 2021-09-16 16:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 235761a558ab6bbb0c35f37940756b1a SHA-1: dc7574dfb075e9490b7b09008a4a07332b34c1dc SHA-256: 2c9ce3c18bddc2d9f3f62039bfb3379efd5028f96c438d28693b86ea082de357
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of many external URIs suggests an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=best+app+for+screen+recording+on+android PDF link annotation
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/25bfc5ddf960aa8d599d765e24614d43/40774700327.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b82dcead4d---fogekomodijifomur.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/sigisuvurinuwosevusabeteb.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/zafitekezatugezemovaxis.pdfIn PDF document text
    • http://turnyras.lt/Files/file/susinidavaposorava.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16132ad290195a---30174445767.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/kilafexelub.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/72866763834.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/vamuvuxoxofubiwigub.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/nedosimumogiguzoteb.pdfIn PDF document text
    • https://filetorme.com/upload/files/94504652385.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/17420328781.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/83233617336.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/28008568467.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/242564735.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/nivisufenufiga.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/37607387232.pdfIn PDF document text
    • http://willowslakerhea.org/userimages/sajamebojulomovum.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/tugisigaju.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/pabexazerigexetumejiseto.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109140008214342.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/80909564800.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210916/1254322491.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/55698558696.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_off0000e948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE948 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001015f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015F 10804 bytes
SHA-256: b90aeba050ddd3efd79a423e50d75e5b4fe88c38b2cba44c3fd0bf90dabb5037
font_02_sfnt_off00011a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A38 18056 bytes
SHA-256: 10476f074f4dbbf90625678c2549ed0ce41528265ad0ce93c809d887198b94d5

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