Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fd2f5bd90310f4f…

MALICIOUS

PDF

74.3 KB Created: 2021-04-02 15:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e4664ef58861abbbdff39b42bd3fe8c3 SHA-1: 7681d8e6f535a5e310f6bf19802b0398f16305fa SHA-256: 2fd2f5bd90310f4fc96c3bfe8e3585d1ed61c0af084dbeb0a0dc275ad57a322e
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicating it functions as a link farm designed to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to facilitate initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://maypoin.ru/award?keyword=character+defects+worksheet+pdf PDF link annotation
    • https://cdn.sqhk.co/jabisopomuxo/ihhbbeu/infinity_train_hazel.pdfIn PDF document text
    • https://cdn.sqhk.co/xumefugafa/fhjr0jf/vijovovulibizasosipos.pdfIn PDF document text
    • https://cdn.sqhk.co/lefuwaregew/Giashjb/best_sports_trivia_board_games.pdfIn PDF document text
    • https://cdn.sqhk.co/wovegase/eHhi6pe/american_civil_war_history_movies.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec36a28e-0f1c-4bb6-a4f8-4f0624fcd4f2/adobe_premiere_pro_cc_2015_crack_serial_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0501e52-807d-49e3-8f87-999359e575d9/sufupitosojozukof.pdfIn PDF document text
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_af40e8db93f24c358107e9cc65905637.pdf?index=trueIn PDF document text
    • https://d1b33a7b-cde1-45d4-bc15-d4d3b6236ac5.filesusr.com/ugd/1d64af_db24e63d2d7e4ee4bf291c163e7e3220.pdf?index=trueIn PDF document text
    • https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_8810c7d6bc88450c94f210b60bf9b69b.pdf?index=trueIn PDF document text
    • https://c78267de-509c-4cb0-9394-6b21b7876e04.filesusr.com/ugd/290ce3_1e5ae7d72b764abe88c31975b26d5af5.pdf?index=trueIn PDF document text
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_11f19b95178e4d489115388daaff39e0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bokelur/job_offer_letter_acceptance_mail_format.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/anxiety_management_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/bifugokakabaxosel.pdfIn PDF document text
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_0f1573a9c12a4c28995c49daf53ee1e3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/falevi/blog_article_html_template.pdfIn PDF document text
    • https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_2e0fc632064b4efc97ff4eccd17fd7b4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7d1bba9-804a-4cfd-a37b-f3cce0a8c9e5/46re_transmission_rebuild_manual.pdfIn PDF document text
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_2a91668b2e5d45e799aff86ba389e9df.pdf?index=trueIn PDF document text
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_fa64412c99ed42629aebc7572f5ba079.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_off0000e69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69C 5272 bytes
SHA-256: d8413e569d102cac9a8a8688c78a4580bb34903d7ae8b1187801cdab35a0cd4a
font_01_sfnt_off0000f897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF897 10416 bytes
SHA-256: 7dd6359bf23e310ee5380a99238ed00d9763b68ce5e93474a8223bac8a4a3d21