Malicious PDF — malware analysis report

Static analysis result for SHA-256 583e3b238e898f46…

MALICIOUS

PDF

78.8 KB Created: 2021-09-14 23:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3b0583c63b3cda994ad72a8c49e4e724 SHA-1: c830f3c35724680f51c6dd024e994b6b72a9858f SHA-256: 583e3b238e898f46e1bb04e95dda453bb37bfe36aa980075ede8e38e24afee7d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various PDF files, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution scheme, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://rentcar888.com/uploads/files/202109080905529539.pdf In PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/jogufa.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/vizizudoxelolemojuri.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/29249789660.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613675251dde5---tojumowuranegaxejotusav.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/42976079194.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/25359764052.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/29305976409.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sijuwanunigabuxovabebaker.pdfIn PDF document text
    • http://dongphat.net/upload/files/kudububudusegazozokuna.pdfIn PDF document text
    • http://khocabien.com/uploads/files/vumebaxegotekojefediju.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/luxapilarelu.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/bowubowidamitumivapubu.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/jejowesitogadaxote.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/xidugofokanafafun.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/liwukuzoliri.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1064cefe6---293811550.pdfIn PDF document text
    • http://stonebreaker.at/49661022840.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/sorigemulifaraboxaxituzu.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/80819865354.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/65705058301.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/movukuvufowidunulinetis.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/98093524455.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/jebudemuxu.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/didusixazoge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=tamil+mp4+songsPDF 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_off0000d22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22F 10304 bytes
SHA-256: 79a80328fd780dd2ac8c5ec2e2efdaa736f10faf787b9b0e7526dd322b3ceab9
font_01_sfnt_off0000e95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95B 17372 bytes
SHA-256: acb94203ff323262d7a4bde84bc0a24bfa27064cec73e553376edb46ea4bceda
font_02_sfnt_off00011626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11626 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1