Malicious PDF — malware analysis report

Static analysis result for SHA-256 599eade626be8528…

MALICIOUS

PDF

84.6 KB Created: 2021-09-08 19:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a03de6449c8e37dd1610f4813d3e2398 SHA-1: 1d0eed6d05a245e11bfae1dc65bb09fc5db534d2 SHA-256: 599eade626be85285d4e739f60dc7eec09c89ca2ae699f85903d349ed7101feb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as a link farm. The ClamAV detection and ML classifier strongly indicate 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 0.9912

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://zkmeiqi.com/admin/ckfinder/upfile/files/62086735058.pdf In PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/710c4fd96dd3adbd0c1b384677dc2392/negef.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/12464783305.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/desakumo.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210905_C4DBA4872BBB945A.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/29229062997.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/zisero.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/59529690988.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/71385017589.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/61160188105.pdfIn PDF document text
    • http://co-mit.com/uploads/files/vusonud.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/resofigaf.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/modejebopuv.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210902001153.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/25569720405.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/kewadudi.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/12419327157.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/dilulasisomememu.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/xeponelojir.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/gudegafonika.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/83548908006.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/bukimeriz.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/95b6f85570b84b0d02637b5f3a416c7b/pavavuxorozejawiwedofovoz.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/28119953268.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/33072671757.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/69519209031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=sagemcom+fast+5566+pdfPDF 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_off0000e49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49E 11000 bytes
SHA-256: 103312be9c60839fefcaa403ed384617a0b6f7d6b04221c704266ca9bdac7b81
font_01_sfnt_off0000fe05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE05 17816 bytes
SHA-256: 78be5cf131ae6d61934bbd1677cca1a1f4314487b319a03b9f3ba434d7413921
font_02_sfnt_off00012ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1