Malicious PDF — malware analysis report

Static analysis result for SHA-256 2642d15fd6a053fd…

MALICIOUS

PDF

62.5 KB Created: 2021-04-09 10:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94707a3ad14961c7f7c605e0deeabac3 SHA-1: d83d4afa264b7beb25efc50f2eb3d43f669eb5c3 SHA-256: 2642d15fd6a053fd308d90293e6759eb3bc2a8673ccc0d303ab4e6a7e2449c1a
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with several pointing to domains that appear to be part of a link farm designed to obscure the ultimate destination. One heuristic specifically flagged the PDF as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6715

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 http://oaklandchildcare.org/sites/default/files/webform/ponezilineg.pdf
    • http://www.pbttphtk.gov.my/sites/default/files/webform/vojazasazobixupolaxi.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/99284441703.pdf
    • https://www.uts.cw/sites/default/files/webform/tizodakemepegipupimegoxi.pdf
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/22206840813.pdf
    • http://www.guninetwork.org/system/files/webform/heirri_proposals/74543186253.pdf
    • http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/96392425525.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/90018929780.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=amaras+al+se%25C3%25B1or+tu+dios+amadeo+cencini+pdf+gratis
    • https://umatter.princeton.edu/system/files/webform/requests/tutoturabawukaxubudevodor.pdf
    • https://printandmail.princeton.edu/system/files/webform/26360011081.pdf
    • https://lib.asu.edu/system/files/webform/46247033309.pdf
    • https://ec.europa.eu/eip/agriculture/sites/default/files/webform/vifixofixif.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1cc.bin
c2d118bc81531844b5940a319f72be14226e1315783e5a1a806874a01f042446		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CC 5560 bytes
font_01_sfnt_off0000d44f.bin
a8906e4e7e987211d1d4f1e8c1eb6646f47ef564efa36229afb898a76cff2388		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD44F 10972 bytes

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