Malicious PDF — malware analysis report

Static analysis result for SHA-256 10adf603d164ebe2…

MALICIOUS

PDF

72.7 KB Created: 2021-09-23 11:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8394fa5c171a5480bdf0ca37fad5ce4e SHA-1: 3bcac0ee2ef181a9730e262351839bc50db61e09 SHA-256: 10adf603d164ebe294db433da22098c96e93c35d1089c35d8863ab8dfab9e891
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing campaign designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the PDF as a link farm on disposable hosting, reinforcing the phishing/malware distribution hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=major+mayhem+hack+apk+download PDF link annotation
    • http://aqcorth.specialty-match.com/upload/files/fosasiluri.pdfIn PDF document text
    • http://popmetre.com/news/files/65224839116.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/bakikukijazurunu.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/ditotepijafuliriwa.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/5274031542.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/nuxabejukib.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/nalovosesom.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/ginivebodoj.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/xugumisonezopemufa.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/21236613488.pdfIn PDF document text
    • http://cudicio.it/images/file/61814702375.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16147833b2394c---1851868700.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/kesumavodapujis.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/65493280429.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/nudiverorevo.pdfIn PDF document text
    • https://parkettworld.com/upload/files/12734611496.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/19584503027.pdfIn PDF document text
    • http://cycling-software.com/files/file/baxegufogevoxojuxawi.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/kutunobaxotelurojukigog.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210914_B7FD46A6C4E71AE8.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/dogugojurefuzud.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/92638471277.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_off0000b84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB84D 16864 bytes
SHA-256: 0601af1e5b2425e5b78248440cd4bd9e83e5082e805613d34de09eca33304f51
font_01_sfnt_off0000e428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE428 10836 bytes
SHA-256: 8ba0ddd3d40751ab449d4734851f97025d10fd93f9a27bd2c633ac49062f54f2
font_02_sfnt_off0000fd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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