Malicious PDF — malware analysis report

Static analysis result for SHA-256 540a064a8175d269…

MALICIOUS

PDF

85.7 KB Created: 2021-09-16 16:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8040acb9b94b5876a1584a25496577fc SHA-1: a7d2a563017790d27b651e3f7dd7c4ac1ed40cfb SHA-256: 540a064a8175d26946628187ae7ad88ed94b2caf491fec17cca3a549fdf9c739
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to other PDF files, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://dalnoboy.com/data/filestorage/upload/files/91864069656.pdf In PDF document text
    • http://glavis.biz/userfiles/file/tixufuvakosolojim.pdfIn PDF document text
    • http://domuran.pl/files/file/sedalidum.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138aec99e3ec---89618616900.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/51362379937.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/rikos.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/ganinur.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/38004865122.pdfIn PDF document text
    • http://trovas.com/userimages/32801501575.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/11047890426.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4127be253---42888101378.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///35867924935.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/22217150500.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/rovopumerubanusotujuri.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/52406218883.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/nemedivivinof.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/lanalukop.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/44510045776.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/95636916959.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/19292836007.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/95420464992.pdfIn PDF document text
    • https://tipresentoio.it/images/file/xuwobowanivosemubara.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/babavomokopafegisep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=off+road+games+for+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_off0000ecea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FC 17172 bytes
SHA-256: 758f6ad14821254c22860b08d4ea61b93243acc4f685fd2680990174bf277df0
font_02_sfnt_off00013162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13162 10580 bytes
SHA-256: 814c4c66e568a52b1257088aa0fc3713031d89c99bfc05843b9b38da04caf148

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