Malicious PDF — malware analysis report

Static analysis result for SHA-256 855ede999d690f7b…

MALICIOUS

PDF

82.0 KB Created: 2021-09-09 15:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: ca59d81da8e144e846af908ba5cdc7bc SHA-1: ad6698cc6b92d3bc90733ab006cbdbfdafaad731 SHA-256: 855ede999d690f7b4e133ed3011e5480f0c7fd9b82fffb2b7db0af00acb536d3
126 Risk Score

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 0.9964

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 http://duocthientam.com/uploads/ckfinder/files/mosezaralovutemarofap.pdf In PDF document text
    • https://bcbc3399.com/upload/files/59957898933.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/pebanezorod.pdfIn PDF document text
    • https://webaprint.be/img/file/36567098689.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/44014682934.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/zodatosak.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/tejabo.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/87304655520.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210903_2A334129B9EFDA30.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021090823185871.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/xujivigevawekut.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133824cdb58c---welomifenamerole.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/bezovewulinik.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://aarogyamedico.com/userfiles/file/titiva.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/davotilasimifemobisuvo.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/99197156110.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/51017559974.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/jewaguxedelapuwure.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/nalirutolijixalikavuwuda.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/38768063369.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/161307561b400a---39684204027.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=change+file+associations+androidPDF 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_off0000dbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAF 10784 bytes
SHA-256: 0044c221425a90cb3deddce6b5aab954457943588a8450ba7f0f04490ed590c7
font_01_sfnt_off0000f444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF444 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C56 17832 bytes
SHA-256: 7503010ca17e81a2309d6647604f8cdfa62d3e420148a92fa56011cdd3c92cad

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