Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3d5e28b6fcd368…

MALICIOUS

PDF

80.3 KB Created: 2021-09-16 13:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3d5db5a6444141cb614346d966429798 SHA-1: 66f43e41a9e5dd2fc7b6545f5b92b0a3f8d789e0 SHA-256: 5b3d5e28b6fcd368647c7aafc7b5550fe8f03c53b73a735c02dee4742e85dfc6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable domains, indicating a phishing or malicious content distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://rooptex.com/uploads/85781936469.pdf In PDF document text
    • http://52963566.com/upload/file/202109132303180092.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/meruwafij.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/66499276378.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/63158313748.pdfIn PDF document text
    • http://novafish.it/userfiles/files/41683557270.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/budinojesuponazamet.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/jimeguri.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/zupiwozapi.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1613df1477ecb8---22083687981.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/xafuvibejonivonapafasom.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/43976873571.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/gegubevitirujidufuroxev.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161428860ddfc1---86076350608.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/84544849538.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/86027750833.pdfIn PDF document text
    • http://imaginove.eu/data/Files/lifuvawuxijasesutekoto.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/zison.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/31987694147.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/dipoxokoteneba.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/banut.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/68520131490.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/65347750941.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/xokokesij.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/13961743684.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=morphwiz+play+androidPDF 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_off0000da58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26F 10344 bytes
SHA-256: 8075509c8e96762f2c859d8ee9d8e105893acd6c15c2982e568d8e165db05c86
font_02_sfnt_off000109b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B0 16176 bytes
SHA-256: ff3f06c16f7c56b456434937ecb1212359c8a5f93ad27e4a7a456cebc2dd5e7e