Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0cf720226201dec…

MALICIOUS

PDF

69.7 KB Created: 2021-09-30 12:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1dd821397bd50290dc103351466cb41c SHA-1: caf82642db9809c0cf212b8081706ba008625e56 SHA-256: a0cf720226201dec6a54ab7b5858c92cf8a6e2c65e59f581d0d099226a6f30d3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document is designed to host numerous links on disposable domains, likely for phishing or distributing further malware. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nzozkrowodrza.pl/uploads/editor/file/kasepopetazaxejakalu.pdf
    • http://contelex.it/userfiles/files/42551892177.pdf
    • http://abwva.com/uploads/files/27384457077.pdf
    • http://wych123.com/upload/files/wuxunufitatiku.pdf
    • https://larustt.com/upload/ckfinder/files/62016092636.pdf
    • https://ferropula.hr/files/83353463786.pdf
    • http://chandigarhdatarecovery.com/files/file/rotogarilijelijowo.pdf
    • http://angelascanu.it/uploads/file/36683567495.pdf
    • http://papianiarch.it/userfiles/files/kejimugavoxaluturidaj.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161484f94b8863---25862319392.pdf
    • http://cathugo-yachts.de/res/wysiwyg/file/83415270091.pdf
    • http://oralrem.kz/ckfinder/userfiles/files/13225505972.pdf
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/26262415005.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/bapuratimujotegav.pdf
    • http://orthocarecentroortopedico.it/userfiles/files/fugogirifoxujovulod.pdf
    • https://mabuksusu2.com/contents/files/1379474326.pdf
    • https://gres-k.cat/userfiles/file/85051283460.pdf
    • http://skiflogistics.ru/userfiles/file/rasuduxexikotom.pdf
    • http://karat-dobremiasto.pl/userfiles/file/79494213481.pdf
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/88659010061.pdf
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/nilikejumanemuwokiw.pdf
    • https://infotechsystemsonline.com/ital/www/img/file/46907758093.pdf
    • https://best-label.com/upload/files/14363064550.pdf
    • https://zapcdn.space/web/img/podborky/files/45008334204.pdf
    • http://sanruou.com/app/webroot/uploads/files/dopoxokepikegurevavofe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=text+heart+copy+and+paste
    • 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_off0000b324.bin
52a2b5fbff0f942d492481fa7306f366a088cfdd18059ab8b183893c21061e61		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB324 14908 bytes
font_01_sfnt_off0000d88a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD88A 16792 bytes
font_02_sfnt_off0000f0a1.bin
0407abb9f09316b4c66e41022aac2c66c5150eb5b9d51f9a9359f4631b856aa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A1 10652 bytes

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