Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a3b589ca3ed74be…

MALICIOUS

PDF

70.5 KB Created: 2021-09-26 13:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fb636f75b42100f9819ce0085304ff05 SHA-1: f8cd9628c13bb5c38a2f0eb9cc5c49d755826f4a SHA-256: 9a3b589ca3ed74bebffbc792de623c6fb162fc6f559cd189b509ff9ff08d944e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous external URIs, including one with a UTM term suggesting a lure related to a book title, and is identified as a link farm on disposable hosting. While no scripts were explicitly extracted, the presence of external links and the phishing/trojan detection strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://philabc.ru/uplcv?utm_term=the+48+laws+of+power+by+robert+greene+pdf PDF link annotation
    • http://mmbc.cz/_data/user_files/file/40151085774.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/takuvetemajazitunofosib.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/89428342960.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/zemavevupi.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/43298574717.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/duzovebodazuloditiwab.pdfIn PDF document text
    • http://wixoon.hu/upload/file/tuwixutuwakukofefi.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/73466183023.pdfIn PDF document text
    • https://panama4d.com/contents/files/rewonerejegerobuv.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/55476011249.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/xetodonipagelenidilajewaf.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/xepekaxivop.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/80260163671.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/boxewutuxaxetum.pdfIn PDF document text
    • https://adamslakeband.org/userfiles/file/gobixafawaxepivawep.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/8296850047.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/39408257817.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/36458943084.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/dirabalalijegezipewosatep.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/89048214080.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/feresuterepufusopomebim.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/gadujufubokuginipalo.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/72863943492.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_off0000b1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B8 11272 bytes
SHA-256: f505ef41bf7ec35e0753099a37bf9339dc1bbe1570f94fbbdb800acf7a698274
font_02_sfnt_off0000e3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E4 15816 bytes
SHA-256: 84ad654b2d672a9b63715c39ebeb379e61fb9bb1af4b3fe24bc14e5362233dac