Malicious PDF — malware analysis report

Static analysis result for SHA-256 11e651fd6ca5dfac…

MALICIOUS

PDF

78.3 KB Created: 2021-09-13 06:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5c886e8f0e5c7f4502f2b19920378b36 SHA-1: 35199f86367958d537490a388d9d7632a6f1b412 SHA-256: 11e651fd6ca5dfac97941e39946c8548df53be432d5fa688725014dd247fb40b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm on disposable hosting. The embedded URLs, such as 'https://allytemp.ru/uplcv?utm_term=android+mass+storage', are likely used to redirect users to phishing sites or download further malicious content. The PDF structure and embedded links suggest an attempt to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://allytemp.ru/uplcv?utm_term=android+mass+storage PDF link annotation
    • http://com123.vn/uploads/file/nufutodajidakex.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/fafejuduzeri.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137547f8afe6---kolamaviwipapubu.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/43331945799.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/zibakefagubijikosavofog.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/dofoniropopexefogiruseta.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/73205538126.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/dagakofa.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf9aa2d608---fabujorudu.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/76653657571.pdfIn PDF document text
    • http://adveotec.com/img/file/juvebuwarepisom.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/gewes.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/13812250557.pdfIn PDF document text
    • https://clinicscrm.com/img/files/69591610117.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/xenevuvupemoxini.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/19669735844.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/69732463271.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/sarokikutitategupinu.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/40948599416.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/38273074236.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/74842842158.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_off0000cdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEE 17640 bytes
SHA-256: 231ceaca976db5a453bf7f7cda5f5046374dece4cc0c4f0b07db152a394c81bc
font_01_sfnt_off0000fc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11463 10528 bytes
SHA-256: 11033cea9feea5c407fe2fe92fc85df8213c895fd7333edfdc2797cebcca0e12

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