Malicious PDF — malware analysis report

Static analysis result for SHA-256 02522864f9e179ac…

MALICIOUS

PDF

113.0 KB Created: 2021-09-20 01:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a3d23c3138abc0c6393eede81c171a18 SHA-1: 6e227f4aed82a08eac1f30ce9a852f05323bcbe2 SHA-256: 02522864f9e179ac11c921eef79b8583b40ebfd98494b4ab002f393a658ea14b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the nature of the embedded URLs and the link farm structure points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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://newgrids.com/userfiles/file/rodubexotaz.pdf
    • http://planao.com/ckfinder/userfiles/files/vapeziwimiwogavasap.pdf
    • http://kxnjl.com/userfiles/files/11233883332.pdf
    • https://soechi.id/userfiles/file/55696009273.pdf
    • https://sanipacific.com/attachment/file/fasupozojoluw.pdf
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/satulezaratugokij.pdf
    • https://get-insurance.in/ckfinder/userfiles/files/jatisoluzobad.pdf
    • https://aldwalia.com/userfiles/files/26899916382.pdf
    • http://www.chp.pl/ckfinder/userfiles/files/wufavikilalesufumelazil.pdf
    • http://chpcentre.com/files/file/kesotatasalojusa.pdf
    • https://copperscraphandlers.com/ckfinder/userfiles/files/gamadulokupan.pdf
    • https://indolabtek.com/Uploads/userfiles/files/90422899986.pdf
    • http://land89.com/ckupload/files/98186121754.pdf
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/64625680892.pdf
    • https://globalmediaminds.com/uploads/files/72619895729.pdf
    • http://hiredriver.com/uploads/assets/files/zekalozejifagopuvuzal.pdf
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/99598793211.pdf
    • https://yuvasarkar.org/userfiles/file/mamudojufijogajezo.pdf
    • https://es21sys.com/userfiles/file/lawobufifakalelusebowu.pdf
    • http://seattledesis.com/fckeditor/file/zizubakizugitoj.pdf
    • http://www.cavice.fi/tiedostot/files/nerumoze.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/qgp5u5ttr6e8choj3c54o8mqeo/palatudeduzimawubepij.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=do+i+need+to+play+xenoblade+chronicles+1+before+2
    • 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_off00014c4f.bin
dc8f4d518fd24e67b8bb59798135adf733dba63e5739b8737a5219c1f92e78ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C4F 11248 bytes
font_01_sfnt_off00016682.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16682 16792 bytes
font_02_sfnt_off00017e94.bin
4183e09128d1667b11acf929372661c50c74e8750bf7db47f9362ab4fd62ffc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17E94 21072 bytes

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