Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb9183d8c1db09b5…

MALICIOUS

PDF

68.8 KB Created: 2021-04-20 19:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9cbbf96ec0626262b05dd50cf5a5bda SHA-1: e6093e38a24eec73e3d45a01060615a23d8d59b5 SHA-256: fb9183d8c1db09b5541d8034e59b203fdedc79b86aec236ebae84de82e050808
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and the nature of the embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.grotekeukens.be/sites/default/files/webform/gmawards2018/98751459569.pdf
    • https://ambrose.edu/sites/default/files/webform/49323480199.pdf
    • https://www.jsif.org/sites/default/files/webform/moridiwivomepagaduso.pdf
    • http://www.pbttphtk.gov.my/sites/default/files/webform/74795851198.pdf
    • http://www.sumnercountyhospital.org/sites/default/files/webform/bavowusakixonodokuja.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/dekif.pdf
    • https://www.a1touchsolution.nl/sites/default/files/jonalizavilivoduse.pdf
    • https://www.uts.cw/sites/default/files/webform/tizodakemepegipupimegoxi.pdf
    • https://www.pharoxglobal.com/sites/default/files/webform/6669476875.pdf
    • http://www.guninetwork.org/system/files/webform/heirri_proposals/38059385999.pdf
    • https://europa-ts.ru/sites/default/files/webform/sujeludepotunebimetoravij.pdf
    • https://www.a1touchsolution.nl/sites/default/files/87400145234.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=skyrim+fast+way+to+level+alchemy
    • https://campusrec.princeton.edu/system/files/webform/16616798570.pdf
    • https://lib.asu.edu/system/files/webform/90369837207.pdf
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cea4.bin
f6e5b0734a6f1b7adb8db6b4a1e4792c00144bcf2db305ea073bb5c06963e9dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA4 5544 bytes
font_01_sfnt_off0000e175.bin
2dbd6f0edb1c6db2b086006d7eb8c8b22331531268b77c97e6ead08418e0dcd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE175 10800 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.