Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ada526987a46a4b…

MALICIOUS

PDF

83.8 KB Created: 2021-09-09 20:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e723c5250524226b46e0ef74895171f1 SHA-1: bd24ecc86395d68352ea484c3fdf1e160a715615 SHA-256: 6ada526987a46a4bfba6c4ae8d3d1c9a2fafd3f13f6db2a29c3844c88dc30ce4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on suspicious domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://gurolmumcu.com/userfiles/file/24323208843.pdf In PDF document text
    • https://nyirfa.hu/uploads/files/73454780595.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/74812501220.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/3853182772.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/napaw.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/45422173434.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/favorogarar.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/tiguxivewufodamuvofik.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/pogivera.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe971b4f2f---80968473171.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/sirivuvan.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/20718548692.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/jokowoxigi.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/bugalatuxinudivazinetu.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/17679767844.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/15175799678.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wujavezufopopo.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/fovepususab.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/57879560674.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/82342094914.pdfIn PDF document text
    • http://shophouse.info/images/files/mijivutoxuzenojinor.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/nabefuxekovazitoxodoxave.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/nizuxetavofufe.pdfIn PDF document text
    • http://fgosvo.ru/files/files/79924687037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=panorama+app+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_off0000e488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE488 10108 bytes
SHA-256: 19eb0eb92a167404fde5c43df879c0952a27ea377f712a0129de70d5ca1658b9
font_01_sfnt_off0000faf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11302 18056 bytes
SHA-256: 02c1ba8db4c7af2760e35f0e0b08e7f332215bb4942511ebd9d6abc37bcea89c

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