Malicious PDF — malware analysis report

Static analysis result for SHA-256 c672c09b3f5db636…

MALICIOUS

PDF

66.8 KB Created: 2021-04-13 08:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: def67ca18398c2740f40d4ba5ecf61a1 SHA-1: 513f72af552d2d074069c68d132baef03a0d5e1a SHA-256: c672c09b3f5db63630fdd4b49cee2799706d00934d1dceed48e90acce992354b
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to domains that appear to be part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics confirm the malicious nature of the file. The presence of embedded URLs suggests an attempt to redirect the user to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8278

Heuristics 4

  • 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
  • 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.pbttphtk.gov.my/sites/default/files/webform/73261430544.pdf
    • https://www.mainephilanthropy.org/sites/default/files/79141676299.pdf
    • https://ambrose.edu/sites/default/files/webform/85138354947.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/bidepe.pdf
    • http://spotlight-sites.com/sites/default/files/webform/jalipoxelelikepobolid.pdf
    • https://ambrose.edu/sites/default/files/webform/7968200385.pdf
    • http://www.guninetwork.org/system/files/webform/heirri_proposals/80098342864.pdf
    • http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/40041164747.pdf
    • https://www.visitsavannah.com/sites/default/files/webform/59391310887.pdf
    • https://www.jsif.org/sites/default/files/webform/vinuriruxelapaviwona.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=tabela+acordes+diminutos+viol%25C3%25A3o
    • https://www.vub.be/sites/vub/files/webform/16824703900.pdf
    • https://community.princeton.edu/system/files/webform/fivedexexefo.pdf
    • https://ec.europa.eu/eip/agriculture/sites/default/files/webform/77241298986.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da20.bin
4757dad29acb197489c9b9117238c7d06f0e47707e0ecc7df013b9fb8a2b9de4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA20 5552 bytes

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