Malicious PDF — malware analysis report

Static analysis result for SHA-256 0081279fca8f4bd4…

MALICIOUS

PDF

80.5 KB Created: 2021-10-10 14:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e72bc426a422e498019970d917c6e8f5 SHA-1: 188fc0a659e418918adcc85cf2590d0309440217 SHA-256: 0081279fca8f4bd4455e6702dd4006b031e7b0bd4dada59ac568935285fdae63
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. The PDF contains numerous links to disposable domains, suggesting a link farm used to obscure the true destination or host malicious content. The presence of external URIs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nppmaudaha.in/ckfinder/userfiles/files/67482745995.pdf In PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/dabejodo.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/bevasukulozeripez.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/pipufadujasowekubukixizer.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/gudepisumi.pdfIn PDF document text
    • http://boxethai38.com/upload/file/watemafo.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/pinilonojinipovela.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/81282463326.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/tunavupinuxitisariwidami.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/duvavixe.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/busosikono.pdfIn PDF document text
    • https://sin-wa.tw/app/webroot/userfiles/files/7766155004.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/nomumowamivub.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/wanetakekex.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/dodimugikilug.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/25457736223.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/polavinosuborujanuz.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/kaxumedexupefowamutuje.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/63929338656.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/mirokojaxegeditadukonesun.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/vosokozitobalotexonape.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/eefo01v13hsuci5a1t4ivfrgog/52085580446.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/fugogexutuj.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/nudakanibisivosi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=mphasis+interview+questions+and+answersPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA7 10836 bytes
SHA-256: 324e692e52c312688d6bf78f1d85c6086544aac714cece03366acdb7d0aa2829
font_01_sfnt_off0000e87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10091 19624 bytes
SHA-256: e349a91324e0d71d68f927f6a1fde7bc6b7819350af151c7f7eb298ff712d738

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