Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6e1a71b348e1882…

MALICIOUS

PDF

73.1 KB Created: 2021-09-20 05:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44365fe8fd839b9d7adf8172d5aedfe7 SHA-1: 0d3bf6347b36d4edf6bf9eafaeafb8481bd777a8 SHA-256: c6e1a71b348e18829b53d3ea93364944f8f7567e30e70b233ad0d91f27e0bd1d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to suspicious PDF files on disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a large number of links on distinct hosts, a common tactic for SEO manipulation or distributing malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://bahamianbrewery.com/ckfinder/userfiles/files/41829741940.pdf
    • http://misr-consult.com/userfiles/file/98215895711.pdf
    • https://manpowernepal.net/ckfinder/userfiles/files/famoliga.pdf
    • http://cl-pub.com/files/files/23442475329.pdf
    • http://www.singchai.co.th/ckfinder/userfiles/files/nabogitevinutegenisi.pdf
    • http://ivankotov.ru/img/lib/file/mukuwazudinifebimulut.pdf
    • http://leinerpakgelatine.com/survey/userfiles/files/75396749573.pdf
    • http://buyyoutubecomments.com/ci/userfiles/files/miroxovugofufedikup.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140f4240a329---95469383438.pdf
    • https://www.l-games.jp/js/ckfinder/userfiles/files/48809806609.pdf
    • https://joebalogh.ro/imagini_ws/54544420247.pdf
    • http://german-ex.com/images/blog/file/81036392746.pdf
    • http://carzip.biz/files/uploads/files/tegokera.pdf
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/zonoben.pdf
    • https://globalathena.com/ckfinder/userfiles/files/2858144808.pdf
    • https://signika.pl/Upload/file/refunubaxexorowikaxodemur.pdf
    • http://gelikonline.ru/content/Files/72843243799.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613d440b1d87f---84655566602.pdf
    • http://rideabikenews.com/user_img/files/38830486740.pdf
    • http://petra-dario.info/upload/datoteke/beravarisudoz.pdf
    • http://addisonplaza.abwingsmd.com/uploads/files/87089365978.pdf
    • http://kondicionery-shodnya.ru/upload_picture/file/94419779641.pdf
    • https://kccegis.com/upfiles/content/file/20210915234540.pdf
    • https://hamzakocakoglu.com/userfiles/file/74077611739.pdf
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/2865796663.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=cheat+codes+for+health+in+gta+5
    • 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_off0000bb2f.bin
b2d6cc05428865f5f8b54495e7cb7aa612b974bad2104a6fd8fddc326107bf1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB2F 10920 bytes
font_01_sfnt_off0000d444.bin
2698d56bfd6ed0b7b93fc87feb77ad64237c01f016d32a6baf93b4cdec635d84		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD444 16452 bytes
font_02_sfnt_off0000fe4e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4E 16792 bytes

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