Malicious PDF — malware analysis report

Static analysis result for SHA-256 76f6e4f3c88c9eda…

MALICIOUS

PDF

80.4 KB Created: 2021-04-13 16:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcaad8bea52aa21b032443666c418220 SHA-1: 1cc7513c5a4d08a524ec44105fc3c2e7a8b8e188 SHA-256: 76f6e4f3c88c9edac52bd3970a89e7302b23a73b32011ea08f8d66576aa09b0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded links, with a significant heuristic firing indicating a 'PDF_SEO_LINK_FARM' designed to host a large number of external PDF documents. The primary external URI points to 'https://xezojetit.ru/strik', suggesting a malicious redirection or download attempt. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/strik?utm_term=excel+formulas+list+with+examples+xls
    • http://tajopujamelupa.22web.org/rixalefubidakenan.pdf
    • http://faketikus.22web.org/antonine_plague.pdf
    • http://kugenezajiz.22web.org/java_8_lambdas_github.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mifaneneveloje.epizy.com/central_and_peripheral_persuasion.pdf
    • https://uploads.strikinglycdn.com/files/b82239ac-5db6-4268-9735-1f21fe29cea7/bunukeset.pdf
    • http://binasizula.rf.gd/pulolosanu.pdf
    • https://033a7475-7ccb-45c1-8f1e-38fd320d48d0.filesusr.com/ugd/03a576_6fd204465d6742f6b162db8d036198d1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7c8735ea-9b79-4964-914b-2276c2d4dda2/soxazetomejaliziwakelu.pdf
    • https://s3.amazonaws.com/vuzufexarevima/malayalam_christian_songs_lyrics_free.pdf
    • https://uploads.strikinglycdn.com/files/77a8c9cb-f2d6-4f3b-8a87-66e2d9ead5a0/free_crochet_patterns_for_beginners_granny_squares.pdf
    • http://tagitefidunun.epizy.com/bozake.pdf
    • https://s3.amazonaws.com/doxifuba/nordictrack_elliptical_ifit_not_working.pdf
    • https://ececae0b-1312-4a4c-959a-117928b3d478.filesusr.com/ugd/e6721e_a605f803f6ee4b8290c07b8d6df50a22.pdf?index=true
    • https://45b0b119-5f8c-43e7-b437-4e12d17c1c81.filesusr.com/ugd/3826db_6d658c26d2384014808e37ee8d2a39f1.pdf?index=true
    • http://fugewad.rf.gd/roleleril.pdf
    • http://tazuwotegopuwo.rf.gd/22899227548.pdf
    • https://uploads.strikinglycdn.com/files/b9ead166-f8ed-40bd-9a21-fbaa38cba766/outlander_book_3.pdf
    • https://uploads.strikinglycdn.com/files/d03326b0-c20a-426d-9b5c-79a272230fa1/matrimonio_eva_luna_montaner_fotos.pdf
    • https://uploads.strikinglycdn.com/files/3205c1b9-ffeb-44ad-bb68-d90e2e327b3c/how_does_brittle_stars_eat.pdf
    • https://uploads.strikinglycdn.com/files/508ed5f1-8c97-4763-92ff-cf20ec1f56a5/fairy_tales_stories_in_telugu_new_2020.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e652.bin
c01d253af27179178bdcf8a42bf1d8d12a2a8ef9c3f17def38729029f60cce4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE652 5372 bytes
font_01_sfnt_off0000f884.bin
2f77ef67803d9bdbd8cbd5a0a0892d89293090fdd16f9862cf52ea341d71ab96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF884 11148 bytes
font_02_sfnt_off00011eaf.bin
9260c1ac56cb25936af30f2130bb0a2148af3e289689888ae8c9d9f223658dcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAF 16220 bytes

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