Malicious PDF — malware analysis report

Static analysis result for SHA-256 73fb86b15bf5e765…

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 01:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2b97952c6719b7cbe5b662f36891da6f SHA-1: 0dbf3413e4f230c819084837b6307abbeabfd63c SHA-256: 73fb86b15bf5e765e008eb249cfbc4971373287748a8c2b951c8bbf4584e7dc4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' firing further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://chcial.ru/uplcv?utm_term=chrome+android+disable+notifications PDF link annotation
    • https://bimore.vn/webroot/img/files/94486550139.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/dutilakamexubo.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/95595494720.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/98638600845.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/gibesosopezawinurafux.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/95223544603.pdfIn PDF document text
    • http://pyhunlian.com/uploadfile/file/juxoguzafukinoxinum.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/71376358370.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/rotilawudanaguxabutijera.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/bafivokojavatubazuv.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/57308543634.pdfIn PDF document text
    • http://blueyee.com/upload/file/022004424162.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/jemebetafaluk.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/wapax.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371cd96b0f3---27812651570.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/duvedexi.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/rewavurobosiroxiligajido.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/93998699407.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/kugudipif.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/mobesigelovip.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///tovevekunekikedebavirale.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/sogukefax.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/3248773875.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://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_off0000d9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CE 18100 bytes
SHA-256: 0e190d6167a3b14652b604a111c7f654eea4ab4c2b04b37a4470d013bff1a657
font_01_sfnt_off000108d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E9 10912 bytes
SHA-256: 05f821c1335d9da745cdbe4ec4be5ee7d11d654657483066ada58bafa88711a3

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