Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb7955cf059e66a…

MALICIOUS

PDF

93.7 KB Created: 2021-04-09 21:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5d31dda7931000ba9a5afedde0462c9 SHA-1: 6b99ee430dad689436971fba83cbd0ed66d2e323 SHA-256: 1cb7955cf059e66a96a22621c9429dd6525a284f90d5cefeeea8401719814850
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to link farms and disposable hosting, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7981

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://www.mothercare.ro/sites/default/files/webform/resumes/95866450710.pdf
    • http://www.sumnercountyhospital.org/sites/default/files/webform/27017481005.pdf
    • https://www.newburghgroup.com/sites/default/files/webform/resumes/falaburisidibiwad.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/bemefunojupupik.pdf
    • https://vectorcorp.net/sites/default/files/webform/resume/danodajanenalidadalibebav.pdf
    • http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/89533113822.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/34904816646.pdf
    • https://ambrose.edu/sites/default/files/webform/nakevatekiviva.pdf
    • https://www.jwico.com/sites/default/files/webform/xojisipet.pdf
    • https://web.liderpapel.com/sites/default/files/webform/xikamiwaboloz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=cookie+clicker+unblocked+76
    • https://www.healthdata.org/sites/default/files/resumes/78922999772.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013b14.bin
5f522405c609bb1936a4d7cfaed70479b55e57ba1384671969a5a024b13ec43e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B14 4888 bytes
font_01_sfnt_off00014bc3.bin
c9118e4a3fe5ccc15805688163d2df151752632e988bfd008b42a61d6d90ef3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC3 5360 bytes

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