Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec918cbc603c4905…

MALICIOUS

PDF

80.0 KB Created: 2021-10-09 05:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c0df6b82502053fc66e1d3226cff5088 SHA-1: 3802be7364dd519f4c9395f062db49c3b275f265 SHA-256: ec918cbc603c4905d0ab196b5aefc7c9c107accbfb3a05b8710b20013764e28e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to suspicious domains, suggesting a link farm or redirection mechanism. The presence of a 'download button' heuristic further supports the idea that the PDF is designed to trick users into downloading further content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://holztreppe.pl/userfiles/file/51194192297.pdf
    • http://thuexe7cho.vn/upload/files/43190095759.pdf
    • http://jadever.vn/Images_upload/files/1330398925.pdf
    • https://peltonfell.org.uk/ckfinder/userfiles/files/sovimatavenenevodezujoku.pdf
    • http://palestraarkadia.it/userfiles/files/zawarigafoganuluvopor.pdf
    • http://biancoacolori.it/userfiles/files/kelepudokalaj.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614468ed8069d---81034934074.pdf
    • https://bednidhitraders.com/userfiles/file/timewixukasinabavo.pdf
    • http://world-green-hope.com/uploads/files/56500540991.pdf
    • https://www.meditech.cz/ckfinder/userfiles/files/62465510140.pdf
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/82383582405.pdf
    • http://shopgraeagle.com/ckeditor/uploads/files/lirilofijududiworakesabor.pdf
    • http://www.gamylai.vn/uploads/files/nemowowumojiputajonu.pdf
    • http://ndfeef.com/radiant/mechimobiles/userfiles/files/23361143009.pdf
    • http://okvin.org/userfiles/file/wowop.pdf
    • https://pielinks.com/UserFiles/file/pebifo.pdf
    • http://btfa.tw/upload/files/98075336086.pdf
    • http://ariogalospspc.lt/userfiles/file/97618953031.pdf
    • http://sanga.asia/userData/board/file/rozinukafitobebil.pdf
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/wasaf.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615b09c517ea9---bezusevipumovokir.pdf
    • http://master-stroi76.ru/userfiles/file/26280888298.pdf
    • https://kovtec.pl/eurostyl/photos/file/surefuresodavafiwaduwut.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=pick+a+number+between
    • 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_off0000d2d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D5 16792 bytes
font_01_sfnt_off0000eaec.bin
c509e5db4e2ccf51579c5047af1068a0ceb0578969ccba76b85dcbb6d8ad7ccc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEC 10476 bytes
font_02_sfnt_off000102c5.bin
4c6a32ed5a638bb6e0866b5c3341adde2915a84b7c18b21803d10124df8960e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102C5 18772 bytes

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