Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb5f44befbdb7fd…

MALICIOUS

PDF

77.3 KB Created: 2021-03-19 08:57:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 44f9b5d5baa9b3542023d9ce1cb8a583 SHA-1: 20b18171fffb475c791c890360aa3b589204b729 SHA-256: ffb5f44befbdb7fdd5c678c281513ed9135faa53fd770dae5f80064eb5e8be6f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('baarspo.ru') that is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host many links on disposable domains, further supporting a malicious intent. The ML classifier and ClamAV detection strongly indicate malicious content, likely related to phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/strik?utm_term=why+do+pens+with+ink+stop+working PDF link annotation
    • http://vinograd.io/the_hobbit_2_full_movie_free_download_in_tamil7ena0.pdfIn PDF document text
    • http://power-guard.shop/474036664808i3rf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489609/normal_6049473170e5f.pdfIn PDF document text
    • http://bluebadge-support.com/sql_join_query_examples_with_answersksl8y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427103/normal_600fd58f32a10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446770/normal_5ff031255b7dc.pdfIn PDF document text
    • http://halfraire.xyz/afsana_khan_rising_star_performance4xrw4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451230/normal_602c116455458.pdfIn PDF document text
    • http://carins.info/wafefozivafuwfslaa.pdfIn PDF document text
    • http://tradestaroffice.com/teorema_de_bayes_estadisticakyyss.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vukusa/98698553897.pdfIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_76989d2d26fb4eefb8da8c690c8151a9.pdf?index=trueIn PDF document text
    • https://170d08c7-2527-4f8e-8bc4-cf7f6ffab704.filesusr.com/ugd/afe24e_0ab240a9fe054153b3639316b0c7a28c.pdf?index=trueIn PDF document text
    • https://e5eb5b25-b33c-43e3-82d5-57ab1bf863d8.filesusr.com/ugd/b0c717_ea491cbde41f4c4ab8a4931349efe5e4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/2314858119.pdfIn PDF document text
    • https://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_5180e20a88fd42ddb2a91fbda21b74f8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jikopot/financial_inclusion_in_india_rbi_report.pdfIn PDF document text
    • https://cc67bef4-e22e-42fd-bf01-3f02b15f800b.filesusr.com/ugd/080020_c4100450b8e84535aa11d95ebd762edb.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_off0000f1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F8 5248 bytes
SHA-256: 2d85535b301fa20f2b249c6096a0fceb92e1e1cf979d1adb2a9fd0f98a85f2b6
font_01_sfnt_off000103f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F3 10516 bytes
SHA-256: 3b58a97868d47d8b5bf357af33510f7813c26fc417fcd824ccc20a148363b864

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