Malicious PDF — malware analysis report

Static analysis result for SHA-256 2122c26fefe5f531…

MALICIOUS

PDF

96.2 KB Created: 2021-09-18 01:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 268f76534b72b40f1f19dfe61de599a0 SHA-1: ad88cdd9ca7353845918c7d694158eb6da7b1ba8 SHA-256: 2122c26fefe5f5311df28dc3c0c3034ffce8301a8fde8c7b0610a2881c21886d
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to link farms and disposable domains, suggesting a tactic to manipulate search engine results or redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs further supports a malicious intent. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 4

  • 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://baltic-rt.ru/ckfinder/userfiles/files/kejonimasokokobawafe.pdf
    • http://tageedesign.com/ssmpt/documents/file/lavekezoxepepivoxuf.pdf
    • https://lifesmart.ro/ckfinder/userfiles/files/rumelavowuxagaralufagaz.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614320eff1820---zalebixijadomozetekaje.pdf
    • http://caythuocdangian.net/images/files/58738758807.pdf
    • http://skisun.it/userfiles/files/nefamumedogaf.pdf
    • https://bhsbeacon.com/FCKeditor/file/99792497086.pdf
    • http://akbarestate.com/survey/userfiles/files/78169876313.pdf
    • http://way-of-spirit.ru/upload/file/gubawi.pdf
    • http://cmtsport.com/pliki/lefegujijudobilunitaxozal.pdf
    • http://ttworld.hu/uploads/content_files/files/vupaxatalinapupufe.pdf
    • https://buzyhub.com/files/roxegakegoxo.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/k1oidg02k6jjigivqg663953q4/63393619599.pdf
    • http://hoadondientu-ptp.vn/images/ckeditor/files/wulebepadotebakiwalenedi.pdf
    • https://www.utn.ac.cr/sites/default/files/files/lemuvilitukaduxazaj.pdf
    • http://elpijisystem.com/file/66510195633.pdf
    • http://allgeology.ru/ckfinder/userfiles/files/wifunivivavatuxiwosojej.pdf
    • http://honeystraw.com/uploadfiles/file/sizogiduvuwuloref.pdf
    • https://e-tta.com/app/webroot/userfiles/files/nogudolajozumutizavakifel.pdf
    • https://ms01bet.com/contents/files/begufesowedipukivefemoko.pdf
    • http://www.anclupnapoli.it/userfiles/file/42054274233.pdf
    • http://veitali.com/upload/files/mesepajeturi.pdf
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/sanego.pdf
    • https://retrofitoman.com/ckfinder/userfiles/files/48675930746.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=paket+internet+murah+indosat+ooredoo
    • 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_off0001139b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1139B 16792 bytes
font_01_sfnt_off00012bb2.bin
3a9e17f53a13dec53a47ecce6ab4dd3f93d1119132f96a938342e302771de26d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB2 10660 bytes
font_02_sfnt_off000143ec.bin
18954aa79072720397dee3de8cf53382d06808841743342cdd91abdea79cf9a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x143EC 17764 bytes

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