Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f738f5aad7ad286…

MALICIOUS

PDF

93.0 KB Created: 2021-09-16 21:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e7a15b3bc182b499d647bbd2f5331f26 SHA-1: 8db7c628b91ce76417c219d40aea521e6c47275c SHA-256: 0f738f5aad7ad28627b81888f94733e67fea4a1fbda958562a934c3e736353d6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly support this assessment. The embedded JavaScript likely facilitates the redirection to malicious sites, contributing to a phishing or malware distribution attack pattern.

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 https://yensaovinastar.com/media/files/89977298082.pdf
    • https://businesslife.com/content/file/9573136084.pdf
    • http://cpgny.com/userfiles/files/46300752589.pdf
    • http://lexus-custom.com/js/upload/files/96148846258.pdf
    • http://travel-door.com/userfiles/file/72938975015.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133c26a718a2---juwugijuvoxa.pdf
    • http://techbico.vn/uploads/image/files/86986621025.pdf
    • http://nebovsem.ru/app/webroot/files/files/67967191570.pdf
    • http://angarakshaksecurity.com/userfiles/file/lekulizenolaxejelexe.pdf
    • https://piauiaqui.com/ckfinder/files/31625797356.pdf
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/wavinosilewulozafilatote.pdf
    • https://taevlingar.se/images/pages/file/80708569373.pdf
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/lijojafaxekok.pdf
    • http://cbstav.cz/file/dokefiz.pdf
    • http://location-appartement-venise.com/italie_documents/files/zabebum.pdf
    • http://kesherisrael.com/uploadEditor/files/77839917114.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fda8d0db5c---94130417855.pdf
    • http://mbjarrahi.com/UploadedFiles/New/file/xitodusewuliluzozumuru.pdf
    • https://taechoclub.com/FileData/ckfinder/files/20210913_E5C910F560F1E81A.pdf
    • http://sangsangins.com/upload/upload/file/bugotesodilasuba.pdf
    • http://www.w.radeton.cz/ckfinder/userfiles/files/81984358040.pdf
    • http://geologicatoscana.eu/userfiles/files/27035975065.pdf
    • https://samirkumarpaul.com/ckfinder/userfiles/files/40645815178.pdf
    • https://gentrilieu.vn/userfiles/file/55484875761.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=en+el+tiempo+de+las+mariposas+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104d1.bin
177d81645901d97800db5bb6bf7e6b8d1671042e8e7a79ead3e3b828b1cae6cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104D1 19276 bytes
font_01_sfnt_off000135cc.bin
a63f0731845877d0b109e2f71f3e257877b862267fa9a7119ec236868a2f6c8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135CC 10644 bytes
font_02_sfnt_off00014e14.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E14 16792 bytes

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