Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fa66920f39645ef…

MALICIOUS

PDF

89.8 KB Created: 2021-09-17 01:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 360115436a8457d2853934210f8740b7 SHA-1: e72404b1b1bc967f151bbdd62b28cc420a4e5503 SHA-256: 3fa66920f39645efaf69a71a7eb8f16633e14ea60db2dffa60df09c115e8b525
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous external links, many pointing to potentially malicious domains, suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://bonekarusa.com/contents/files/piratew.pdf In PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/51273979683.pdfIn PDF document text
    • https://coevent.ru/upload/files/medibutuzotutavurijidajut.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/gibetomatenujinuk.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/49798423805.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/69684027035.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/82196212702.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/sowufimejezaboma.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/97921394600.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/62098773823.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/gizoxatezulokadewe.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/nopifugixebirofotezaj.pdfIn PDF document text
    • https://anfauglir.com/images/file/92948592942.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/tosotajajubikove.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/wexeniminopinajazabi.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161357aaf75b4e---64839459033.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109111254008115.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/69105851292.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/77249184126.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/49475569856.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de9e0021f3---28329569932.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210901173243.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/venupegixepiwazejemugize.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/19790077661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=nh%E1%BB%AFng+game+b%E1%BA%AFn+s%C3%BAng+hay+tr%C3%AAn+androidPDF 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_off0000ebfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFD 29288 bytes
SHA-256: c966172e3b5dbd0e36929e897b5ad188e0433ca1591bd0ce31611b834347b697
font_01_sfnt_off000124ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AC 11668 bytes
SHA-256: 2013ec0eafb96f1884710efff8d6802543b683215f41402c74945f38f749ad36
font_02_sfnt_off00013f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1