Malicious PDF — malware analysis report

Static analysis result for SHA-256 e123d824bbdae87d…

MALICIOUS

PDF

70.4 KB Created: 2021-09-27 20:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0ef4c574f8a561f90f22e0110170f3e7 SHA-1: b3b6b0b627a8ee86e3c4ccaafc4a1bbee555b38d SHA-256: e123d824bbdae87d4e6b361d1b44cb345d34eb02f7e7da4643face96d8486c7f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to PDF files on external domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure strongly suggest it's used as a lure for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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.
  • 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://shethof.ch/cgi-bin/dynamisch/file/51022689117.pdf In PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/siseva.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/farutapaxowulifotolexi.pdfIn PDF document text
    • http://stroi-sistema.ru/img/tojunowetopexokovuwu.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/40659271797.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/71303714011.pdfIn PDF document text
    • https://drlanda.hu/user/file/90051208926.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/14898664817.pdfIn PDF document text
    • https://anjingliar.com/contents/files/jatudinasewotovixesa.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/penolenorokoguwe.pdfIn PDF document text
    • http://manu-transport.com/documents/file/rorenojawanipapewusazizu.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/78097805241.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210909075110.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/tizakutumugokivekalosilu.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/bikekogiteposomedu.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/8821902619.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6fd70b19a---1137941550.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/pasovudakenotosasofo.pdfIn PDF document text
    • http://taixingchem.com/uploadfile/file/20210906050123341.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/19374419854.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/10472357808.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/0ac35f0510f851942b2ff9cc1e79a2c9/55715524519.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=world+war+z+android+gameplayPDF link annotation
    • 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_off0000ae61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC673 16948 bytes
SHA-256: 56b2b74d5b9ddcd01d6f2741519c53dced298f597b70db48337846b5846d40be
font_02_sfnt_off0000f234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF234 10720 bytes
SHA-256: fc4597b8ae6752e6f6bda6f60ac95579dea6be429adbac13cbdd0d374bc7b746

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