Malicious PDF — malware analysis report

Static analysis result for SHA-256 cedb63ccb5456b4f…

MALICIOUS

PDF

69.1 KB Created: 2021-09-26 03:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7445d2a9af25bec7c0843b6da474e78 SHA-1: 9d209ff8b5b7a1e73a0fd6b1aa00a5255d7f0367 SHA-256: cedb63ccb5456b4fd5c4cd491bcbe95493f105f53a35e411bdbb823d55c27aff
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code or redirecting users. The presence of numerous external URIs, many pointing to disposable domains, strongly suggests a phishing or malware distribution scheme. ClamAV detection and ML classification further confirm its malicious nature, likely as a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=how+to+screen+record+on+a+moto+g+stylus
    • https://portalbime.com/UploadedFiles/New/file/najawerisufof.pdf
    • http://agierresrl.it/userfiles/files/37421846595.pdf
    • http://linklandhotels.com/upfile/editor/files/vatebejawupa.pdf
    • http://aow.infogestnet.it/ckfinder/userfiles/files/62804301823.pdf
    • http://labotinnghia.com/img/files/zaduxulimirapulenevon.pdf
    • http://parmalab.it/userfiles/files/nizigavason.pdf
    • http://myphammonly.com/luutru/files/ririvegezafugafifoj.pdf
    • https://jeevadhara.org/work/london/userfiles/file/topaxiroraz.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b90b20acfa---7956488597.pdf
    • http://urduhadith.org/survey/userfiles/files/tepetixa.pdf
    • http://mbfeed.vn/upload/files/somomijefi.pdf
    • http://mobiliteit.nu/files/wawaxav.pdf
    • http://studio70.eu/userfiles/files/98448208774.pdf
    • https://tranthachcaodanang.com/uploads/image/files/dekatisaguf.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/f60d6290b8771d817c66b3d93cb6516f/lugidavonijake.pdf
    • https://transmar.biz/ckfinder/userfiles/files/lunutowibu.pdf
    • http://doingthing.com/downloads/blog/geust/files/salabaroferizoboda.pdf
    • https://etadelloro.it/images/file/binizogebanafo.pdf
    • https://sanmuabancongty.vn/images/content/files/54979436144.pdf
    • http://wksx.top/images/userfiles/file/jeturukamatukumuja.pdf
    • http://haenuri.net/ckupload/files/safemapotumiladixi.pdf
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/jowiredagupum.pdf
    • http://geose.ru/userfiles/file/sudosafaromewuxamosi.pdf
    • http://apmnir.ro/fckfiles/file/23663561569.pdf
    • http://thermcom.cz/userfiles/file/47343880727.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_off0000affc.bin
5477578728f06414e529894a45104329fea09b64b7861f194cffa6ab3b64482e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFC 10912 bytes
font_01_sfnt_off0000c91e.bin
501d8709e4a4127070f5b0080b8b97633eb936684b0f56900862baa01b6a58a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC91E 14908 bytes
font_02_sfnt_off0000ee9e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9E 16792 bytes

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