Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfca264837d5e6b3…

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 22:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 37132a4b28fa65030599d440b1e38301 SHA-1: 312dbc8a4323e2e3d83aa1c6435e6c1d5814a024 SHA-256: dfca264837d5e6b3e35409b5314845712aecf962cf3941e5ddd1cfdf54444201
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it's designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the primary goal is to lead users to a collection of links, likely for SEO poisoning or to host further malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.aillant-sur-tholon.com/ckfinder/userfiles/files/pototuzuravawojafiwoba.pdf In PDF document text
    • http://mariancozma.com/_user/file/sevifetaveduma.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/rebif.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/11318183275.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/sisidu.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/30341212518.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/tejewiwogulazavix.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72543514397.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161374dcd8dfa0---56773806775.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/20183576910.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/75e6a9a163912b1fbb838b286d623174/funametupeli.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/safakuwu.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/9609927885.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/34680497271.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/jozunuwuzubinixa.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/kazapuj.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/85541018986.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210906210513.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/36374483515.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/nawupirewezipizewi.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/18474923652.pdfIn PDF document text
    • http://yjccnc.com/upload/files/fujowesedumakuzaru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=porn+games+apk+download+freePDF 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_off0000af5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF5A 10828 bytes
SHA-256: 31a7c32b592f651642073c5fad721fb3cd63587480c9e10ccaefcb4f0ce753fc
font_01_sfnt_off0000c83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04C 16172 bytes
SHA-256: 68ac6cc79e7b97491b2b813acd422f8eabae1d120513ae77466d087e2c50d8ed

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