Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b39e572c0d9620…

MALICIOUS

PDF

90.2 KB Created: 2021-09-19 19:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9320738bba103adc1d37ea6feb28169a SHA-1: ea141bcdd4f3d34a29bb0860697f21de4c19359a SHA-256: d6b39e572c0d96203492a64d73d20bb3d99e2a138726127fe0de6e66cf721768
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing and trojan delivery mechanism. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document attempts to trick users into installing software, a common social engineering tactic. While no scripts were directly extracted, the presence of numerous unknown URLs suggests the document is part of a link farm designed to redirect users to malicious content, likely a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://zeci.nl/im/image/nasuxukafogalagexasimur.pdf
    • http://medical-1669.com/userfiles/files/60945223281.pdf
    • https://fceresources.com/ckfinder/userfiles/files/32909334941.pdf
    • http://sanalights.com/admin/admin/uploadfiles/file/xerumapekikot.pdf
    • http://yds-wcv.jp/free_images/files/43531223724.pdf
    • http://consorzio-csa.it/userfiles/files/wuwemapir.pdf
    • http://makassitools.com/userfiles/file///sowekur.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a865c1cd4---konemijelekarefonim.pdf
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/69496796290.pdf
    • http://www.europesolidaire.eu/userfiles/files/89972682828.pdf
    • https://webmakler.org/userfiles/file/lanobu.pdf
    • https://termofriz.rs/files/puvawo.pdf
    • https://shih-tzu.ro/files/file/dewotemefujewizanoworu.pdf
    • http://www.ecvbrass.ch/user/web/file/sefilonutolikiguxat.pdf
    • http://arcenevents.nl/site/upload/files/82777230913.pdf
    • http://bipaf.org/2009_home/upload/editor/file/putuboberajeremefasame.pdf
    • http://mamolenasnc.it/userfiles/files/sukojiloti.pdf
    • http://tomgiongvip.com/uploads/files/file/40543820226.pdf
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/39679097919.pdf
    • https://cyklo-wellness-penzion-palice.cz/content/zawisazozunozila.pdf
    • https://majubesar.com/contents/files/83262778712.pdf
    • http://kedehg.com/ckfinder/userfiles/files/vexenafodumadoxeleko.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/50999865106.pdf
    • http://umrllc.com/userfiles/files/97172516243.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=best+document+viewer+and+editor+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_off0000fbd0.bin
f76aac438d2f13e15118fbb735fee0dc11c70a46aed282d8762b84730d8cda67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD0 10896 bytes
font_01_sfnt_off0001151c.bin
ed5ff6c951905d1bbb6cc76f206f8e70c799b06cd7cd29027807c6aefcacf3d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1151C 17652 bytes
font_02_sfnt_off0001430b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1430B 16792 bytes

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