Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e41c13e5fb8a053…

MALICIOUS

PDF

74.0 KB Created: 2021-09-20 07:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 24dc5c083805d48162135383ff5371a6 SHA-1: b2d80334ef59cde675118838a34a05ffd24fe482 SHA-256: 2e41c13e5fb8a053f00664efbdebd753954eef1aa98a0103697f4653ad5abf76
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, with a notable heuristic indicating it's a link farm hosted on disposable domains. One URI points to a raw IP address, suggesting an attempt to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://medvor.ru/uplcv?utm_term=android+wear+os+download
    • http://yourbuilding.ru/userfiles/files/kuwetoz.pdf
    • http://aapltd.net/userfiles/file/nuzozowoduzakinujuruk.pdf
    • http://chixue.com/uploadfile/file/20210905130242.pdf
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/fexadixefuji.pdf
    • https://ecohort.biz/userfiles/files/gezelajakepuwefos.pdf
    • https://charming-dc.com/uploads/files/202109032159038073.pdf
    • https://restavracia02.com/userfiles/file/petig.pdf
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49216229662.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/ae40de8fbeee3e01de002436e0ce99da/duzomozozunemijiwo.pdf
    • https://soudurelausiere.com/upload/editor/file/mopopuw.pdf
    • https://telechips.com/ckfinder/userfiles/files/safufomisobote.pdf
    • http://140.121.125.49/ckfinder/userfiles/files/20210918_122348.pdf
    • http://nhatminhtrading.vn/app/webroot/uploads/files/bafexede.pdf
    • https://hohsingfiber.com/ufiles/files/pijopudivusukenum.pdf
    • https://matricula.arendic.cl/files/45692796071.pdf
    • https://doublehaircenter.com/upload/ckfinder/files/40156149736.pdf
    • http://ptichile.cl/userfiles/file/48436283031.pdf
    • http://inbeeldt.nl/userfiles/file/gaxufumepomefopukabuti.pdf
    • http://kfoodntea.com/dataroom/file/wunopusasaxarajoligiferi.pdf
    • https://eslms.com/userfiles/file/savifaxagatipo.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/827f30d5038876ffcdcdf7afa8cdb08d/77194341999.pdf
    • https://fratellifurloni.it/file/88606255038.pdf
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/pugebativifozidomimubopeb.pdf
    • https://hinodanang.com/uploads/image/files/vugibazipetazevi.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_off0000be7b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE7B 16792 bytes
font_01_sfnt_off0000d692.bin
29b7b1a9e0e9c1f55725d763871c822371c417dcfea0d3f59c09aedb5afd7e8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD692 10208 bytes
font_02_sfnt_off0000ed9a.bin
dc21bb53f5f50007b1a50ab55976f9c077a8ac8df49e194303a2d85b010f9016		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED9A 17344 bytes

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