Malicious PDF — malware analysis report

Static analysis result for SHA-256 8697dd5487d34de9…

MALICIOUS

PDF

87.9 KB Created: 2021-09-20 00:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5ebd7e1898cf5b0b029267b0f38db5ab SHA-1: 52b13cee75f028672718a53fe64e0739360b6fbe SHA-256: 8697dd5487d34de9522efe1d062da548a55740142f2a7d404e19eb2207838382
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting it functions as a lure to redirect users to potentially malicious websites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating the PDF is part of a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crewmak.ru/uplcv?utm_term=english+file+3rd+edition+student%27s+book+intermediate+key+pdf PDF link annotation
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/a3836c3254e49fba1268e3558a45503f/xebij.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/fupibidum.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/30126131801.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/98564038849.pdfIn PDF document text
    • http://hydrem.ru/images/file/93639598134.pdfIn PDF document text
    • http://fitviewer.com/files/file/roxofojaminegozoteburuf.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/zuluxexidoxebapevenolax.pdfIn PDF document text
    • https://buyafranchise.org/files/files/79191814581.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/lananizeferuzig.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/54321604207.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/81947992764.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/lewewubisojef.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210901181744.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/sikokamoge.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/xipovebawakekazime.pdfIn PDF document text
    • http://chamdure.com/DATA/files/64031009041.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/44680010958.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414d0b5b00c---75323832369.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sifalukaverenixez.pdfIn PDF document text
    • https://kildevangen.dk/files/pifosejofo.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210902055422.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/tajolove.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_off0000ec62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10479 11580 bytes
SHA-256: 449c1cdedc47331464296091d995f8464e07102e6208ef9c3750b9679c1c4d51
font_02_sfnt_off00011f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6B 19392 bytes
SHA-256: 5f7523652f547862f7ecbffe1f6c4f52fd05a19adb1be610ebcbd7e13f6411a0

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