Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e112e25290f0c7…

MALICIOUS

PDF

71.6 KB Created: 2021-10-08 21:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6cf8fe414a1d5274105afee168a71020 SHA-1: f1ceb849e51ab408886d6155d1ab817d9a967f75 SHA-256: 87e112e25290f0c7dbe50e2d4b50acba9d402f096b405636ee24cce47ad675d8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to PDF files on potentially disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://tecresconsolidamentorestauro.it/fck_data/file/84819938631.pdf In PDF document text
    • http://siblom.ru/files/upload/file/valibefewadedifesu.pdfIn PDF document text
    • https://rn62ug59c-to8.com/contents/files/28786680852.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/20337543264.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/3848890709.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/48692677153.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/26635052764.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/puxalazinexelesagib.pdfIn PDF document text
    • https://12waktu.com/contents/files/54218907092.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/26173997762.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/50125316709.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613da5153b4a3---39724891114.pdfIn PDF document text
    • https://dogodanang.vn/uploads/image/files/69401088273.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/75433909471.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/66954285569.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/26950668243.pdfIn PDF document text
    • http://bwc.lt/i/66918189986.pdfIn PDF document text
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/81103296038.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109010857498739.pdfIn PDF document text
    • http://advairtech.eu/assets/userfiles/file/foxukoz.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/80046437410.pdfIn PDF document text
    • http://bubb.cn/up_file/file/24711647517.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=difference+between+will+and+would+usagePDF 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_off0000b56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB56F 10976 bytes
SHA-256: e4869af59603d827dcc3c2fe8187d9981f7a7c7d4ac64c20662578326dd06385
font_01_sfnt_off0000cee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE6 16348 bytes
SHA-256: b0f834e7c44b48fb6434e278d006b1fc6c724d23c183d66d3ed8d66efa92341a
font_02_sfnt_off0000f885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF885 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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