Malicious PDF — malware analysis report

Static analysis result for SHA-256 3de6cd4f53ee9e95…

MALICIOUS

PDF

79.0 KB Created: 2021-09-17 09:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fcbd73fa47966fbdfea450d2ab003fad SHA-1: 50b020fbcaddbee67daeddea4149b06c330357c8 SHA-256: 3de6cd4f53ee9e95ae7394f862efec179af7cd200e8350f7d72d4ae0376f7d0c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to domains hosting other PDF files, indicating a link farm or distribution network. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://sibservis.com/ckfinder/userfiles/files/62926398047.pdf
    • https://ncvpte.in/userfiles/file/xuwijadovimerot.pdf
    • http://chanhbon.vn/media/ftp/file/fikejupenuwetar.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9803b927c---xevasegubabalobib.pdf
    • http://vetsnab32.ru/userfiles/file/bugakovodarozotafifomig.pdf
    • https://virtrade.gr/userfiles_lybo/file/duziwanimera.pdf
    • https://soyana.de/js/ckfinder/userfiles/files/kakajulenojanawemapog.pdf
    • http://zrdb-drogbud.pl/Upload/file/nujofugapunujobo.pdf
    • https://vicareyou.com/userfiles/file/83982885436.pdf
    • http://cathyknightwaite.com/ckfinder/userfiles/files/76712321039.pdf
    • http://celyroknaterase.sk/editor_uploads/system/files/fiwagedisot.pdf
    • https://episcopiaoradiei.ro/files/risagigezoroposomefu.pdf
    • http://cachnhietcacham.vn/Images_upload/files/julopewadila.pdf
    • http://elturo.ru/img/upload/files/nuzugoga.pdf
    • http://capri.lt/userfiles/files/84675292212.pdf
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/5897030849.pdf
    • http://qataminational.com/uploaded_files/userfiles/files/29585638498.pdf
    • http://chipgene.com/image/files/20210903_052719.pdf
    • http://globalone-mould.com/gbw/fckfiles/20210910181547.pdf
    • http://lpc2529.com/piceditor/file/vojanilajexawixifupovapop.pdf
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/51297672655.pdf
    • http://canphantich.net/Images_upload/files/43242393628.pdf
    • http://kesherisrael.com/uploadEditor/files/85700020752.pdf
    • https://costabravas.com/uploads/localidades/files/kisog.pdf
    • http://mosme.org/uploadfile/files/74490625214.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=psp+iso+apk
    • 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_off0000d26a.bin
9cb17e9828138ee29a1b3d7749925d50e4d8af417078bf4466f74a4b28f8dd64		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD26A 17856 bytes
font_01_sfnt_off000100f2.bin
9ea78ffb1bd31b2a6a00e45bb23ed54dc56a22e0639ca89394e1aed994de32e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100F2 9856 bytes
font_02_sfnt_off000116c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116C4 16792 bytes

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