Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5af9fb48d0278cf…

MALICIOUS

PDF

68.1 KB Created: 2021-09-26 12:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 62c44e517f82e067ca19ba41a97bc326 SHA-1: 68be5ac557e35a8ca6b54ef01f074d8eb925be4b SHA-256: b5af9fb48d0278cf8d0a9246184141cd476325ad6c64679477ce1beb967d600c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to PDF files on potentially disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jamxmpharmatech.com/upload/files/bukom.pdf
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/11993434221.pdf
    • https://newtop-eg.com/userfiles/file/93320374647.pdf
    • http://litho-and-co.fr/ckeditor/upload/files/45391363647.pdf
    • http://marsalanoleggio.it/userfiles/files/54519994284.pdf
    • http://chiari-web.com/ckfinder/optimist/files/25421527008.pdf
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/34856438331.pdf
    • http://przedszkolenisko.pl/userfiles/file/89007778220.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c653540e2d---19220035783.pdf
    • http://kingkady.com/uploadfile/files/mixew.pdf
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/2772108768.pdf
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/25198466629.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614a266f0f21e---nepuwepiwedafi.pdf
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/seziwaxadav.pdf
    • http://royalleasingny.com/admin/images/file/vidagewefalofo.pdf
    • http://woodlander.sk/grafika/file/7480946592.pdf
    • http://gostinica-domodedovo.ru/files/woxuwijojuweva.pdf
    • http://beming.com/ressource/site-image/files/3596697437.pdf
    • https://szabobuszrendeles.hu/files/files/mobenadetirajep.pdf
    • http://np-laser.com/upload_fck/file/2021-9-20/20210920215259609642.pdf
    • https://khangle.vn/uploads/images/files/44471774519.pdf
    • https://almuhja.ps/ckfinder/userfiles/files/bikox.pdf
    • http://kwiatmetal.pl/userfiles/file/24166578044.pdf
    • https://pontus-sd.eu/uploads/file/87008098748.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=shake+flashlight+app
    • 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_off0000ae50.bin
130113c8731af756cbcce1bd961af1d48fa17f867e1adfae6c30ed35af48032c
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE50 10480 bytes
font_01_sfnt_off0000c64a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC64A 16792 bytes
font_02_sfnt_off0000de5c.bin
1155d9c1bade44bd18934cc89c1813d8876b920d033f639ef5db2b0cc4ca75be
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5C 14748 bytes