Malicious PDF — malware analysis report

Static analysis result for SHA-256 81333b1602fc8eb0…

MALICIOUS

PDF

81.8 KB Created: 2021-09-20 01:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 75085fb2bb4fd32263bee9d4229ff9e0 SHA-1: a064a029a3050f0b05985921d3e5d3fc074fc9a8 SHA-256: 81333b1602fc8eb091d52c2fdb36bd53a601fe850e1626f0f0977ae8aad3843e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm on disposable hosting. It contains numerous embedded URLs pointing to external domains, suggesting a phishing or malware distribution attempt. The presence of PDF-specific heuristics like PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=i+remember+nathaniel+bassey+lyrics PDF link annotation
    • https://mami-m.com/Uploads/userfiles/files/12228504316.pdfIn PDF document text
    • http://glassick.com/userfiles/file/67637848155.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/gonuzozoletaditisaweku.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109050507049911.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/73325048718.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/muwoledugokitowu.pdfIn PDF document text
    • http://eternoohydro.com/d/files/votejajesolaradoredo.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/9801664354.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/2263813752.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/rp9cucsn8mlqka2gumlp6cnt4c/34093531085.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/53184984272.pdfIn PDF document text
    • http://iphysiology.ru/upload/33461320849.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/75800511592.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/poxegokeke.pdfIn PDF document text
    • https://dcimx.com/files/92852138461.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/25328702782.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/19037784086.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/puxonijobasosijavotoz.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/94175353412.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/77484261054.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/kuxijazupomokuwetit.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141de79d6563---fuzubunijefasozejidune.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/filana.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/dapowanototixewenonopi.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/50855116142.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_off0000da09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF220 10580 bytes
SHA-256: a019cd882a82d219b08fc017dd84170977616e02ab395e1e8dee7d3a429664e3
font_02_sfnt_off00010a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A17 18464 bytes
SHA-256: da7148d606aa8ac29c0fe7ccdd43fae2d58aff854584a8df4e7a14a0dd1519bd

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