Malicious PDF — malware analysis report

Static analysis result for SHA-256 4acdf4122530d5d1…

MALICIOUS

PDF

86.0 KB Created: 2021-09-09 07:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b62754b58a4d3407794d098e5500aa30 SHA-1: ce4ad2bdbe6857fcaab0e345e20bfdba072d3c25 SHA-256: 4acdf4122530d5d1d5e6223c14300e73e40be9c184c3620d030f237aa8db1f06
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external links, many pointing to potentially disposable domains, suggesting a link farm designed to obscure the true destination. The 'Password-protected archive handoff' heuristic indicates the document's purpose is to trick the user into downloading a password-protected file, likely containing a malicious payload. The embedded JavaScript is likely used to facilitate the download or redirection process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/ladisike.pdf In PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161392f0aa1586---namubodotuvenekiruxom.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/suwawa.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/45755792011.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/xoniget.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202194165555442.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/sajiwufu.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/13694697937.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/19238719274.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/24487193980.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/75887521983.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/73866945037.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/72567298618.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/66590426865.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/86766138807.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/benufopolixetu.pdfIn PDF document text
    • https://kiptep.ru/file/garivikukokepikikewilowo.pdfIn PDF document text
    • https://coluer.ir/documents/file/vilanewitowekawoped.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ogerexeluradir.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/jemowijikureji.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/33242770741.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=daredevil+born+again+pdfPDF link annotation
    • https://easyown.ddproperty.com/datas/files/70761260992.pdfIn PDF document text
    • 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_off0000e8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B8 18892 bytes
SHA-256: 17382b6932d8bc076a229d7924343bae7c4acfb7d999afe29bbc4a7580e1d489
font_02_sfnt_off0001327f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327F 10616 bytes
SHA-256: 73e8d769b4cf891c37ee75887978c633c7587ba9ef116b4137e6a66785e3e81f