Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cfe357bb89ad65b…

MALICIOUS

PDF

85.7 KB Created: 2021-09-23 16:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d9b3beb67dc13e0576751b82434d9473 SHA-1: b362b32aee66ac638add6adba648497b6ee626b7 SHA-256: 3cfe357bb89ad65bcd3e3d5d13f385e86c21abc764941e8bf3db5b0a310a37b1
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to a link farm, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, highlighting the use of disposable hosting and redirectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://ptichile.cl/userfiles/file/69485884864.pdf In PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0de02c253---92826551978.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/jetaxapixutajode.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/lofazaganewiv.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131c4af376ea---tevejikejemasazeromevid.pdfIn PDF document text
    • http://nhuahoanglong.com/luutru/files/wenuwepizokolug.pdfIn PDF document text
    • http://hueide.com/upload/files/91803127195.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/69945148627.pdfIn PDF document text
    • https://birudongker.com/contents/files/54278755529.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/33664814891.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/92079925248.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/202196125212.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/36406746448.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/kevadamikorigareloviw.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/wowan.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/86180077867.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/57456643187.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/ruziteneze.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/21318726301.pdfIn PDF document text
    • https://motoralbini.it/files/file/nilibosanotifomagejasemo.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/13674971301.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=angel+numbers+737PDF 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_off0000e9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C4 18332 bytes
SHA-256: e664d997b2eae35ee44c6939e0efdbf5353f85ddf9f2fc1ddf498d8e86210c38
font_02_sfnt_off000131e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E0 10424 bytes
SHA-256: 9eb2fdf5588d4bfeaefc239372642f5a3c6566dd5d4d34e27e9cc5e7b67aff6d

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