Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c0c9d7ec1863c08…

MALICIOUS

PDF

90.0 KB Created: 2021-09-17 03:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c8ff47c902a715ff4fd54a98f5d6dec8 SHA-1: f26a42121d9dca7bc0f57950694143904ec05c9d SHA-256: 1c0c9d7ec1863c0840e604bfd9db1d45a1dcf7d098509c12b25c762bdb051546
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document's content is designed to trick the user into installing a browser extension or update. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a social engineering attack aimed at compromising the user's system or credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://catwalkdogcome.com/editor_upload_image/file/judimitikavaborigetejuwa.pdf In PDF document text
    • http://reichspfarrer.sk/file/85219342949.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/87073856857.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pumimomovuxegufuf.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/69569784737.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/18239509827.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/49631904838.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614093fb9a42c---78869672353.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/34534860829.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/tuzizus.pdfIn PDF document text
    • https://pierreseche.fr/userfiles/file/36261029559.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/wesunujotos.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/75337174588.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/43206785567.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/labaxuxavujikufoj.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/26194420301.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/61214713151.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/40132062893.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/43538836153.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/95048054986.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d3dcd9d80---43288957720.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/16694118877.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/fiwidededijejozofumotosek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=screenshot+on+android+tabletPDF 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_off0000f81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001102c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102C 19296 bytes
SHA-256: 39de715859fcb8b2ffbbc660a2d7757d3b775c47cfcfe9de5070e22887b52dcb
font_02_sfnt_off00014221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14221 10684 bytes
SHA-256: 7ab31a9fb66049bf2c55f8785f02f6a28f9b097546d35b3c3747a72725453249