Malicious PDF — malware analysis report

Static analysis result for SHA-256 67e15736593f95d4…

MALICIOUS

PDF

74.9 KB Created: 2021-09-18 11:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fef83f66c65b36ffc86e0461b9d6aa97 SHA-1: 18f770fe616d8a677241948e10e6b5180da4de92 SHA-256: 67e15736593f95d4b88296039ec6322968c29a2561521d552e07714c4165460f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports a phishing or scam campaign designed to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://richmore.kr/uploadfile/fckeditor/file/71931594715.pdf In PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/fugan.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/33100622174.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dilaxonajozorawok.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/patevidevevev.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/94488670553.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/loreruzusazuwedakidi.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/30035465926.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/t11ue62ka53vjsft8cqr55okc1/karaxetagijiginijusa.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/13420093379.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/merajolubariw.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/24709473645.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/nuxujijitemojokokaj.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/51280590350.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/dirofina.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/29448168419.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/45489974715.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/bawiwagelenam.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/worasabopumov.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/10972143161.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/8858428608.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/70862641417.pdfIn PDF document text
    • https://find-domain.lazy-online-shop.com/app/webroot/userfiles/files/17664740447.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/keleko.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210908160916.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=download+cytus+fullPDF 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_off0000bde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE2 10444 bytes
SHA-256: a1c6c4c2f108e7ff15855d90cc08a7c0180dd95d7e9f8eb3fb5317d208d03137
font_01_sfnt_off0000d5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CE 18536 bytes
SHA-256: 90792cbbe0e341572cb4bbbef2052313ed2ded5cc032d7e3e1d8ff1f1682e1ca
font_02_sfnt_off00010647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1