Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff4c63f71bad73f…

MALICIOUS

PDF

82.5 KB Created: 2021-04-15 07:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 7a8b91a3816df7f22f25a8b9cd88fdbe SHA-1: 560c1186c837899b4ec59b44d4162739fcf2826c SHA-256: 8ff4c63f71bad73f0d41cb8833393977e4801b92537abb12a2fcd46280dcff0f
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and is flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious phishing content. The document body, though partially corrupted, suggests a lure related to car maintenance, specifically resetting a check engine light. The primary malicious URL identified is https://xezojetit.ru/strik, which is likely used to deliver a secondary payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://xezojetit.ru/strik?utm_term=how+to+reset+check+engine+light+nissan+sentra+2004 PDF link annotation
    • http://woziwowariv.sportsontheweb.net/xamudos.pdfIn PDF document text
    • http://zoxolumaxanilop.iblogger.org/how_to_clean_a_proctor_silex_coffee_pot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450240/normal_600844844ee3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500904/normal_6051e7428b11b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497110/normal_6002d5e601ddc.pdfIn PDF document text
    • https://dofewomal.weebly.com/uploads/1/3/4/5/134510420/6027149.pdfIn PDF document text
    • https://mafalipakirufez.weebly.com/uploads/1/3/5/3/135347960/7e1fbccd.pdfIn PDF document text
    • http://wijasagasipode.getenjoyment.net/gekigugenuwuwavufuxa.pdfIn PDF document text
    • http://zipafaxelati.sportsontheweb.net/me_and_bobby_mcgee_ukulele_chords.pdfIn PDF document text
    • http://zomosidotewe.sportsontheweb.net/psychology_test_questions_and_answers_in_telugu.pdfIn PDF document text
    • http://kebilosudo.22web.org/33468934648.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466664/normal_5fe159be1f76a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://visugog.myartsonline.com/learning_advanced_ms_excel.pdfIn PDF document text
    • http://golinab.rf.gd/biodata_format_for_marriage_file_free_download.pdfIn PDF document text
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_ccc3a7166bd84bc3879eb8c9dae6fee8.pdf?index=trueIn PDF document text
    • http://wadoromutisagar.myartsonline.com/webakevenikonulonejed.pdfIn PDF document text
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_34e877cb244148bebeccd26bd21a4325.pdf?index=trueIn PDF document text
    • http://japixunatavaxi.rf.gd/sp3_hybridization.pdfIn PDF document text
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_67de2097a0d3443f91b1430ae91d2da3.pdf?index=trueIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_25b814a10a384be2b47833893221304f.pdf?index=trueIn PDF document text
    • https://d99d9bf7-a5e0-49f2-90ac-0d1bc881463d.filesusr.com/ugd/0182ef_e619362509f84091beb6f9039b766835.pdf?index=trueIn PDF document text
    • http://nakarajibap.myartsonline.com/junepimugatujipafa.pdfIn PDF document text
    • http://suwifubol.epizy.com/77906657645.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10357 5540 bytes
SHA-256: edbfcf007f08e62991e9f515e192aa62f92c8af98689444d638314093718ddbb
font_01_sfnt_off0001163f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163F 11160 bytes
SHA-256: 68e3769672a6bca2cc1424b73e01683f8294e3392ee437881dd236042634c859

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