Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc9acd25f6c131de…

MALICIOUS

PDF

93.2 KB Created: 2021-09-19 20:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2675114effe772666d7ffc08850fa956 SHA-1: 32c0765a8747a3f0073f70ef602c796cbe122189 SHA-256: cc9acd25f6c131deb798bc868efba98ce81abc248eb0f6b6367dc6f33ebb5f5c
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF sample was flagged by an ML classifier as malicious and contains numerous embedded URLs, many of which point to potentially malicious domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used to host a large number of links, characteristic of phishing or malware distribution schemes. No scripts were extracted, and the document body was heavily obfuscated, preventing a deeper analysis of its specific content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 4

  • 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://aviatroglo.fr/IMG/file/sidofibanusekijuxanod.pdf In PDF document text
    • http://sushistoryus.com/uploads/files/11230418041.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/15700341922.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/rulakesezoxifafon.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/2947779487.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/16932840900.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/55343213437.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/57748176372.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/80090150957.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/52786298964.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/82145610040.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/33470081053.pdfIn PDF document text
    • http://gaudi.tw/upload/file/12993119550.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/resufemedafokosug.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/busikuwesaselenifofevox.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407adf12236---pugumuvawepe.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142b30557a24---88958264130.pdfIn PDF document text
    • http://klhl.com/userfiles/file/pagiporibowuzidi.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/40817146307.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/xirajak.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/59910427090.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/19138152107.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/vofebevafepevum.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/27752849910.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/tetexipen.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021091601491980554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+setup+outlook+office+365+on+android+phonePDF 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_off00010475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10475 17908 bytes
SHA-256: 75c1030b4f837f54dee5a49e299f267b2be6d0e80699a61b0df370fd053e12ac
font_01_sfnt_off00013345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13345 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B5C 11460 bytes
SHA-256: 521b5a386e392700f6c5cae917015eba25b35e0577d7ef4b2f0c344f8ec7fcf5