Malicious PDF — malware analysis report

Static analysis result for SHA-256 f99be9fb8d79aeef…

MALICIOUS

PDF

80.1 KB Created: 2021-09-16 02:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6cb940c9a3ea6f96e3b7a47d8e47275c SHA-1: 11e9a3369980cf5d6004b6087d852014ad711f7b SHA-256: f99be9fb8d79aeef3d80e47a912b5d7448d1a7c229f8fa6d2ebed186e09f02f6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to disposable domains, indicating a link farm designed to obscure the true malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the pattern of using numerous distinct, low-reputation hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://vonschickenconcord.com/uploads/files/xuxasedobizifamuna.pdf
    • https://www.meditech.cz/ckfinder/userfiles/files/dijulowulegugop.pdf
    • https://madame-tina.com/ckfinder/userfiles/files/dujamanadulojepotojin.pdf
    • https://sogelec-eng.com/files/ckfinder/files/83069778238.pdf
    • http://infinity8talents.com/userfiles/file/zosexajigebotejedad.pdf
    • http://loscogliodifavignana.it/userfiles/files/wukupuxapisipenam.pdf
    • https://crc.creativechange.net/ckfinder/userfiles/files/vogubogosux.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/f32701c447de3be1eed6d00552319f0a/begoxepazilexifo.pdf
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/gaxivasagutamebopaled.pdf
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/71902380288.pdf
    • http://thegioioto.store/upload/files/bewenelumon.pdf
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/fakarikivininosesagamuf.pdf
    • https://bostaninsaat.com/image/files/52117745713.pdf
    • http://antracit.topmebli.com/content/xuploadimages/file/22011438058.pdf
    • https://nedimgame.net/calisma2/files/uploads/25870732776.pdf
    • http://www.tractortools.cz/ckfinder/userfiles/files/38204133777.pdf
    • http://lngpetro.com/userfiles/file/9936690987.pdf
    • http://premiumcsp.com/uploads/files/35389695219.pdf
    • http://cellesekorea.com/ckupload/files/12751333794.pdf
    • https://ctcitsupport.com/media/files/64988139165.pdf
    • http://ltpbetel.ro/userfiles/file/41100727921.pdf
    • http://obrienbuilders.com/userfiles/file/rugepakepudikejitokoderu.pdf
    • https://franchise-vietnam.com/app/webroot/img/files/91653002995.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=top+10+offline+racing+games+for+android
    • 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_off0000d511.bin
61578b006eadb411b2446d55b9202784c2e902af535d3bfbf8062e8ebe9372ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD511 17012 bytes
font_01_sfnt_off000100f8.bin
18be21253002f2eb46a99ab84e1e362d3f0c97c64b9834e3b7baaaac007eec82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100F8 11000 bytes
font_02_sfnt_off00011a4b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4B 16792 bytes

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