Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ac67428bb0f8e7…

MALICIOUS

PDF

82.5 KB Created: 2021-04-02 10:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4f17d3f9f51b1a4c4812d2e42c582eca SHA-1: 9a14f8478f81876b115f3f9460a5c16ba1dd717a SHA-256: 40ac67428bb0f8e7bd6ca3d000a85916409ae6117d5b2c6656d41c0620f0dcc3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/strik?utm_term=what+pokemon+games+is+red+in PDF link annotation
    • http://leririv.sportsontheweb.net/farmacos_antimicoticos.pdfIn PDF document text
    • http://1fps.ru/malimawumawobobipasgwvbr.pdfIn PDF document text
    • http://lozhobelir.space/thetford_c200_toilet_seat_riserdq6js.pdfIn PDF document text
    • http://floradoma.net/livro_lpi_1rh5lg.pdfIn PDF document text
    • http://malespw.xyz/likopobzxub8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_b0941ed52c104bd8a6abecbda709ead9.pdf?index=trueIn PDF document text
    • https://626fb5af-1d67-41cb-86ce-204163677ff0.filesusr.com/ugd/9d869b_b1abc496ac214664bb465319dfe3f05f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/ancient_egypt_social_pyramid_worksheet.pdfIn PDF document text
    • https://9c12218e-e157-4070-b33f-4467b3cb42bb.filesusr.com/ugd/0c60a0_2477f85a205f471086d2fc09bd6f106d.pdf?index=trueIn PDF document text
    • https://18bc7be3-897e-46c1-a475-efc190d089bd.filesusr.com/ugd/62845f_77369cb6c73e479f941b2de2f13fafd5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lusabifef/gakorazakedewasabube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/371e319e-85ef-4c0b-b7e3-23e226ab0928/xuwumamadoguwowewutakozu.pdfIn PDF document text
    • http://pikubub.onlinewebshop.net/zixalekuvoxelixetom.pdfIn PDF document text
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_9fecdf3d62e0430cb7e3f1f9696760d9.pdf?index=trueIn PDF document text
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_249a89dabe8a4a6bbcb28f9132201559.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/59f1ad82-0d4f-4ec2-ae64-604303d5e8ad/32552086146.pdfIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/fasarejodumirifur.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/99216483326.pdfIn PDF document text
    • https://b81e1767-bb0d-4562-9f98-cfef66859bb1.filesusr.com/ugd/b48b60_0a890fcdd1934b0489360b9051b5b647.pdf?index=trueIn PDF document text
    • http://popofisofol.myartsonline.com/crossfit_wod_maker.pdfIn PDF document text
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_575ca7ceee244796be62a207f8c1969e.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A7 5416 bytes
SHA-256: 5fb6f33adcde0153b69660a3f220f8af5ff725c83c83b7963b10f611047ce6d8
font_01_sfnt_off000114f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F3 11588 bytes
SHA-256: bd6a932329fbc9136757f815f70df7470a9a40b46235c007596285a941304428

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