Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8d438ee07934ec…

MALICIOUS

PDF

73.3 KB Created: 2021-09-16 02:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c859fb4a46ddbd0f2b1bdd550b5024f2 SHA-1: 7349af3e43c552666ebb2e6b5bcc5d9d7dd51ad0 SHA-256: 4a8d438ee07934ec7e55f79ab09627273420b5be361a2d1aa4baeee4c78d0623
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it's designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggests the purpose is to funnel traffic to a collection of other documents, likely for malicious purposes. The ML classifier's high confidence further supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aptwash.com/userData/ebizro_board/file/72864263623.pdf In PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/80974911107.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/55786723826.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/77541127031.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/divuwetupegobetam.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/kovitapomovebudorumarano.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/80786680833.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/kaxoxomojivunujodenane.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/53349299145.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20219215589527.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/rewap.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/wafuwawiguvorejiji.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/11586024377.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/75385282805.pdfIn PDF document text
    • https://cmf8.ir/data/file/kidipezufozonisoz.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/zebiduvojogarugajo.pdfIn PDF document text
    • http://tajilin.com/upload/files/34203500640.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/pebulenositudefafe.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/derugaxajepofa.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c496eb491---fovukafevebug.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/daxazedebolonejamirepavur.pdfIn PDF document text
    • http://ibsdhc.hpds.work/ecdemo/web/js/ckfinder/files/files/85792934661.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/xelugoselezum.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/97053127422.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=engine+2+recipes+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_off0000bfdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDB 15836 bytes
SHA-256: 6413440706b6ef76d969d374415b063121528d7d1f0f107ec2050f549a54a337
font_01_sfnt_off0000e814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE814 10472 bytes
SHA-256: b59516ca1e2ebcbf8641fb4b278a2b202aff506e2ede0a46d0a97bbd8a17265b
font_02_sfnt_off0000ffbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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