Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f5cee652f7088a…

MALICIOUS

PDF

83.3 KB Created: 2021-09-18 10:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bcd40f11ed72378173a2b1e8a9c2a4d4 SHA-1: bfabcb2257de3a1773fdf46d20de539c57b74987 SHA-256: 66f5cee652f7088a24f354f1fb2b9b6aac3c266d57695dbd3462b56fed2a1a18
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host many links on potentially untrusted domains. No scripts were extracted, but the presence of numerous external URIs suggests the primary goal is to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://allytemp.ru/uplcv?utm_term=jean+gimpel+the+cathedral+builders+pdf PDF link annotation
    • https://ooo-kenk.ru/userfiles/file/8263936438.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/vixulerusukegiwa.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/80226725929.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/fc1790db2706c929dd927eebc79d6cc8/fujuzasolosowofo.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/pavubonirabog.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/levorapukotise.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/fakakuzadeneronom.pdfIn PDF document text
    • http://kunbot.com/upload/files/taxofujuwitugevipago.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/xawutuxefufe.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zigutegug.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141929a832d9---39946420565.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/6544234079.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/94565534197.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/pukogifixig.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/xiregudafoxel.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/22499146670.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/96167220786.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/53410020202.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/12911218663.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/kuwaxakizulefazidara.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/fusozojozukun.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/dowoxaxipipobiliwas.pdfIn PDF document text
    • http://soc-in.com/data/media/files/noliwitujudim.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/gofikavutipenupuxixa.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_off0000de00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF617 11180 bytes
SHA-256: 57008a0156faa68a47fd38584946c8b81531389aa25f2967f3f5d65d8b2cc1a8
font_02_sfnt_off00010f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F91 18412 bytes
SHA-256: 02597da02027126dfbfbc9d73a99f45a72a8e0b33abd9b44183ab447ec6090ca