Malicious PDF — malware analysis report

Static analysis result for SHA-256 65dee26655d6129a…

MALICIOUS

PDF

78.8 KB Created: 2021-09-11 19:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5fa6a9ffa68a4e6b01910b71daf3b529 SHA-1: b1e01ba085cfc63957eca4e41affa044e371831a SHA-256: 65dee26655d6129adeee83472a3a81ee527542b7e010d65aacdb68bdf4243da0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to other PDF files, suggesting a multi-stage download or redirection scheme. The presence of a 'download button' lure further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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.
  • 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 http://acrclubinversores.com/files/galeria/files/57475127641.pdf In PDF document text
    • http://tryinvest.eu/userfiles/files/kozobizexafetezipuwu.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/33466762372.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210910203054.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/bubokegax.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/45892623278.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/xugazavaxawufam.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/xarotabimomimupajexafu.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/97225859671.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/xarebojobosoga.pdfIn PDF document text
    • http://feg.vn/uploads/files/kivozomokegalikorafuzabag.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/35107843742.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/284145402.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/piponomiwoxul.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/wabififepomik.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/24550883390.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/51809292589.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/vomeloxupi.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/keduvotiledixafit.pdfIn PDF document text
    • http://ilkemymm.com/image/files/manipidi.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161377105a6482---makemawit.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/56203361480.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c6233b486---ramemiwod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=spider+man+gba+game+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_off0000cf8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8A 17808 bytes
SHA-256: 147affecd27247bb9ee2ad530153caccc687703247cb9d225fd50815ef5bc165
font_01_sfnt_off0000fd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD93 10772 bytes
SHA-256: 27631758b0a48e6fc5a8f73f7242357dda6e02598b721e024a3b31a0fa5a3d6b
font_02_sfnt_off000115e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1