Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d377023a52d3f7…

MALICIOUS

PDF

88.0 KB Created: 2021-09-17 12:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 00fd57f1bfe856e2e53d2e807f9db0b9 SHA-1: 685652a0a8009b1dc4a5dc001dd771d5ea1c0c01 SHA-256: 52d377023a52d3f7875045a76947d47294e81233cf2a5694ccafe2de8719ebf8
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to act as a link farm on disposable hosting, likely for malicious redirection or SEO manipulation. The ML classifier also flagged this PDF as malicious with high confidence.

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 https://coretry.ru/uplcv?utm_term=dua+for+good+mental+health
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/77649907122.pdf
    • https://zenmobile.in/jaipriyart/uploads/files/80426646835.pdf
    • http://ng-sons.com/userfiles/file/nepin.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130260f0ee47---46355567043.pdf
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/penivilakobazigefugaxu.pdf
    • http://bresky.cz/res/file/mekupi.pdf
    • http://abwwilson.com/uploads/files/xokixosawij.pdf
    • http://thienminhgroup.com/uploads/userfiles/file/83194501108.pdf
    • https://bitree.com/ckfinder/userfiles/files/20451002287.pdf
    • https://euchebnici.com/img/file/naxinixurifaj.pdf
    • http://miroslaws.com/ckfinder/userfiles/files/77089500630.pdf
    • http://zae.me/datafiles/file/73913552681.pdf
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/godoxedo.pdf
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/sejox.pdf
    • http://geometramaurotozzi.it/userfiles/files/2140608133.pdf
    • http://sapientgenerator.ru/files/userfiles/files/wozanigab.pdf
    • https://stmpallet.com/ckfinder/userfiles/files/51227760674.pdf
    • http://shengnabei.com/uploadfile/file///2021090621284759.pdf
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/nurifuzakajolub.pdf
    • http://severstroysnab.ru/userfiles/file/sigujawitowaxovugugew.pdf
    • https://bientannamhuy.com/wp-content/uploads/files/58942540174.pdf
    • https://transdeliveris.lt/userfiles/file/24193303788.pdf
    • https://inprovitbolivia.com/ckfinder/userfiles/files/gagivamefapilisopijaxom.pdf
    • https://alarouba.com/ckfinder/userfiles/files/85026839442.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6ca.bin
74bd29e7283b58f75ec410e73525993462fbf3f2ef7b561e3f287760e2393111		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CA 23060 bytes
font_01_sfnt_off00012214.bin
ef995e034a39e3c8220991dac6b1ccac9f0c30590290cbb309049ce949caca43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12214 10644 bytes
font_02_sfnt_off00013a0a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0A 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.