Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5ec04276c54be99…

MALICIOUS

PDF

90.0 KB Created: 2021-09-21 05:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1646107b54ada8fb498e47372a96292d SHA-1: 0da2dfed1cf0e06927ec8adecb25be48d64988d7 SHA-256: e5ec04276c54be99cbd946cd418e4549819b14a31457d96632a3634ed2cfdc7d
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one that appears to be a redirector. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of a 'download button' heuristic further supports the lure-based attack pattern, likely to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://pixomot.ru/uplcv?utm_term=head+first+java+book+pdf+download PDF link annotation
    • http://traiteurluc.com/userfiles/file/84560520997.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/16136473020.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/vukijokem.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/vcoqlqmgum9ioo66h4m6udjo31/fowizuzo.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/dazujojokiwalomomisaxede.pdfIn PDF document text
    • http://strandedtattoo.com/file/vukibataverelimawor.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/nalolamalunevogisev.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/10070735500.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/11643976170.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/81814177087.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/fodunila.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/90662014812.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/tilokakapirosoj.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161334782bb52c---masawatoxonup.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/63696169947.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/21456544647.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/93751918645.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/beropadisipop.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210903_2F38B410F56CB6E7.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/kopasefanuz.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/vuzazakugudesilidiv.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/33242910583.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/39174856372.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_off0000f899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF899 10996 bytes
SHA-256: 449df1c8f74877a6566f1d367b38a43f0d1aa671c99e49a5efb97ebd370198da
font_01_sfnt_off000111fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FE 18748 bytes
SHA-256: b51810aa0bc41cf9a27c2f15ed8c08bb44a2aa0172c4aa1fe78df3e23a8ca0b5
font_02_sfnt_off00014260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14260 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1