Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec407a06b6c3f347…

MALICIOUS

PDF

74.2 KB Created: 2021-09-15 20:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 224149ccf7ddfd24eb1b0b90c418f95b SHA-1: 86ad5a57dc9d6d7f8f8b33ead5056ef7d95b8ac2 SHA-256: ec407a06b6c3f347d2b433170db652de78d78d7f012589377cd849670efcdfcd
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 disposable hosting and form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to obfuscate the malicious links or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/32929036885.pdf In PDF document text
    • http://actinq.nl/upload/file/18504709606.pdfIn PDF document text
    • https://profesa.net/userFilesfile/40809012111.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/kuvosimubulo.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/58371517626.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/zajetibugekenusetutekajar.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1631602451.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/nakugeru.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/69728231970.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613d125081842---dirifavuruzepusu.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/mamutumiz.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/74559533039.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/lafegemapudubifipufa.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/renexiwapusukin.pdfIn PDF document text
    • https://hoongnau.com/upload/files/fofekisaxiz.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/77513448233.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/gazexijetowigujimisudavis.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/jasapewonakexej.pdfIn PDF document text
    • http://imbirimbir.ru/files/90893948347.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/80169093674.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/sufusazexosevatalel.pdfIn PDF document text
    • http://regmac.net/userfiles/files/24883351063.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=vidmate+apk+2019PDF 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_off0000be7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE7C 10536 bytes
SHA-256: 5b5cf4f8edc16b74e00da27819fa70a062ae59a6e2c2e0ed41fc2cbc20848241
font_01_sfnt_off0000d693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD693 17444 bytes
SHA-256: bf349663bf9252bced5c8a6cb4006187f7a262cd939921a60d3983ff624af486
font_02_sfnt_off000103b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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