Malicious PDF — malware analysis report

Static analysis result for SHA-256 33cdfe923ab913ca…

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 06:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 572c031feae79740050ad3755cef9055 SHA-1: 85a5d252df2ff5646019cbcc29a4738ce7bffc4f SHA-256: 33cdfe923ab913caeaf730b69aeb5be945e09752d6b1d43f757fcbb384cb7dbf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links pointing to disposable hosting, suggesting a tactic to obscure the true malicious destination. The presence of many unknown URLs further supports this, as they likely lead to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://parkettworld.com/upload/files/30965587700.pdf In PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/61832133651.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/rilaw.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/8063061873.pdfIn PDF document text
    • http://secretsocietygroup.com/temp/vinney/HTML/userfiles/file/89873859336.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/nibebusiz.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/60419713136.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/12092478554.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/subojokekefafole.pdfIn PDF document text
    • https://la-klamm.org/Files/files/68316293880.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/37020054920.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/zurulonivixabuwur.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/komagivodijagatuk.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/gurawivojugutejosutar.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/31728749794.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/98498922822.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/78155457898.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/39798653394.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/hudhta0ncb9ai3tt4ha17a6l8a/41973695122.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/38979952768.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/62397544307.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420bca7052c---24817454362.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/79016703994.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/13583062789.pdfIn PDF document text
    • https://tempegaring.com/contents/files/bidifilima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=double+tap+screen+on+and+off+appPDF 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_off0000da3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24F 17992 bytes
SHA-256: 1a75833a8997093a86a8e122dacb6923fad172d7db6125c71d376bda7ec6616e
font_02_sfnt_off0001211d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211D 10760 bytes
SHA-256: b165bc6ce8e598a52d704e3de7109dbbd7aa88edbf4bf724040735101073284b