Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a650b8e739cbf0d…

MALICIOUS

PDF

77.1 KB Created: 2021-09-20 00:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9f9cfb87370d8cfe7a3c4e4e22130023 SHA-1: 27990f3740b26e6d673cd8d14d920c02d55d8c7b SHA-256: 3a650b8e739cbf0de551823dcacf16bb0184127c364dc0c694163d6d10fbc92c
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and a heuristic firing for a 'download button' lure, suggesting a phishing or social engineering attempt. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the presence of many external links, including one pointing to a potential APK download, indicates the document's purpose is to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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 https://oniceh.ru/uplcv?utm_term=free+download+apk+among+us PDF link annotation
    • http://laulumaja.fi/ckfinder/userfiles/files/kavukuko.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/mipidowedetudubifurovakox.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/ddecffb60165001c80ff0620bb8e9496/60683659457.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/jevebuxuwozumixujimubiwa.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/11343389295.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/zosesaxu.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/mogezofe.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/zetonalotupuwerotab.pdfIn PDF document text
    • https://projetovm.com/uploads/files/32855342974.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/33316990580.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/67925510658.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/jikep.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tuwipurufaxebugumad.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/fikekagob.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/doxujun.pdfIn PDF document text
    • https://empresa-venta.hr/files/mikesexinut.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/pitalabis.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/giweva.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/21938440403.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/74965328916.pdfIn PDF document text
    • http://ukrfirework.com/images/file/naxebinenivizixoz.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/71546398520.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/pidutewemisevasomaz.pdfIn PDF document text
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/19858119401.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC926 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13D 10800 bytes
SHA-256: 5db625f16a8675c8f236df5b0921f5d0a497919f23526d40eec992feaaae4b94
font_02_sfnt_off0000f9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F0 17420 bytes
SHA-256: 253d17292c7d0f99fd893ec04ea4e2b5b74e6f833026c203c0f12f8da3700727

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