Malicious PDF — malware analysis report

Static analysis result for SHA-256 e365155c97b99eb6…

MALICIOUS

PDF

83.6 KB Created: 2021-09-17 13:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3a02b6d4f4e32a9520e7b4ecfd5a5666 SHA-1: f7049ba51c17589ee3d1cdde0c66a380f461a486 SHA-256: e365155c97b99eb618a59fb7bf311c988d673cb652f72a308267cd659b1e101f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm. The primary function seems to be directing users to external sites, which is a common tactic for phishing or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=transfer+calendar+from+android+to+android+via+bluetooth PDF link annotation
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/39455484311.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/tokedewuvi.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/raxazof.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-14/20210914115609196308.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/98689394571.pdfIn PDF document text
    • http://wdnederland.nl/file/48889233907.pdfIn PDF document text
    • http://hotechike.com/files/files/67760146180.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/fojozetibo.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/segidalosuxaxonenuju.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/dalaxurixamumegibunarapez.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/99140759231.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/47970749472.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/ridifafedikezigufumexilo.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/3702741473.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/fijes.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/16614417968.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/37841741104.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/wajupubekofo.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/8175467849.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/wadow.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/bunelevoronaxe.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613398dbea4db---83659664964.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109151307101252.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_off0000e045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE045 17644 bytes
SHA-256: f1cc7e4e9952394225c839371d498d64607cd37ef2351e248c5ee73ede7add99
font_01_sfnt_off00010e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001268c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268C 11012 bytes
SHA-256: 5be22aa861e38b914b832487936eaf0cdb7ce11108587963805f25dbafcb2519

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