Malicious PDF — malware analysis report

Static analysis result for SHA-256 de2cef339e8f4a0a…

MALICIOUS

PDF

79.4 KB Created: 2021-09-12 07:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc7e31dcab36c9a88492f799e6d44b73 SHA-1: e0c67fcdcef039d74e5803387bf3fcbdeb2d981b SHA-256: de2cef339e8f4a0a52a9007e18257ed96d8203e51b7cca2658a11e439b58a6b1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics, including a high-confidence ML classifier and ClamAV detection. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The presence of 'utm_term' in one of the URLs indicates a tracking mechanism, common in phishing or scam campaigns.

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 https://chcial.ru/uplcv?utm_term=mobdro+pro+apk+no+ads
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/bizadarudumevurus.pdf
    • https://bientannamhuy.com/wp-content/uploads/files/66360760667.pdf
    • http://naturestuff.nl/siteimages/file/sulodukenotariserepu.pdf
    • http://graczeonline.pl/userfiles/file/juruwopatenibumix.pdf
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/15538237339.pdf
    • http://tieulongcopro.com/luutru/files/fogudegoronuvanebivin.pdf
    • https://emilline.dk/ckfinder/userfiles/files/bapobonoseto.pdf
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/6492324457.pdf
    • https://groupunsur4.com/contents/files/nabemeful.pdf
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/nusisaxutila.pdf
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/gagufunanon.pdf
    • https://penzion-palice.cz/content/belidiwiwukulufof.pdf
    • http://federicozucchettiarchitetto.eu/userfiles/files/31965130782.pdf
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/nikidibenelogowavuwuz.pdf
    • http://nextlab-semi.com/files/fckeditor/file/99392203409.pdf
    • http://vkp.ru/upload/global/file/rutuf.pdf
    • http://szpk.hu/_user/file/78176040461.pdf
    • http://denis-lefebvre-services.com/fichiers/file/53928573901.pdf
    • https://cherrychile.cl/cherry/uploads/contenido/files/71929168818.pdf
    • http://phone-server.com/userfiles/file/xosepiniwazifobitamorema.pdf
    • http://ceramvetro.net/userfiles/file/puxoxevi.pdf
    • http://speed-r.com/js/upload/files/dubazaninugefajabu.pdf
    • https://novamakine.com/upload/ckfinder/files/vonapi.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/f0c867b10ec0302f799259f1baa77c78/79158568602.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_off0000d3cf.bin
9ceefec599f1a623b3e8b983427b0a4c53c62b6945a04a4275088355b510e8ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CF 17560 bytes
font_01_sfnt_off0001011f.bin
99295336d48c5a514fe07e74b1b6318362abee778aca924107c147a43b477ecc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1011F 10244 bytes
font_02_sfnt_off000117f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117F8 16792 bytes

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