Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f66329ab4554d07…

MALICIOUS

PDF

83.3 KB Created: 2021-09-24 08:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 018b7f03eac101afd2b42036fec6c051 SHA-1: 7e12750e3fb49c1dff47077b39419936914d867a SHA-256: 5f66329ab4554d076f1fd9b969b0e341f14b1fbe2867fdff2c407eb6c5683870
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • 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.
  • 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://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34921255217.pdf In PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/6387896804.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143323b27035---97080324534.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109030110451050.pdfIn PDF document text
    • http://oris-am.com/editor_up/nuzigulofatamipupamo.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/genulagobujabagavutafekuf.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109121517402628.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/97963818447.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/99650882911.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/99135618174.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/lagobu.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137371ed72a2---kiverejolexujafuwajaz.pdfIn PDF document text
    • https://777mto.org/contents/files/tikezedusojonamor.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/momof.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/doramowisanajiri.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/28143269740.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/27104535782.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/13030403327.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/bexifoxis.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/28019393351.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/96675171428.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/bumelezokolixediregirosu.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/xiwalemovozoler.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/papofe.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/bibaguzunudanegumej.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/60166698531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=farming+simulator+14+mod+apk+downloadPDF 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_off0000e135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE135 17088 bytes
SHA-256: 760bf734a33365e44ed7942c24a5e680837e95a7f9651221444e8fc707207315
font_01_sfnt_off00010d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001258f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258F 10988 bytes
SHA-256: b62a665254d8ad571c991a71b419d6b18c73505e671d7f225168d3285326f315