Malicious PDF — malware analysis report

Static analysis result for SHA-256 924cfbced2e6812f…

MALICIOUS

PDF

62.6 KB Created: 2021-04-06 20:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 974aaed8ca26fdf14c3d28e81c804538 SHA-1: 050d04148dc4d6bc3320931b951dfa100756da30 SHA-256: 924cfbced2e6812fc4435532c1a96cca5a6303a52179907cdbd944e4132afef2
124 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. The document body, though heavily obfuscated, contains text suggesting a lure related to 'Joindre pdf dans word'. The presence of numerous embedded URLs, many pointing to suspicious domains, indicates an attempt to redirect the user to malicious content or download further stages. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a link farm designed to obscure malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://portal-mysigma.com/system/files/student-proof/72808970040.pdf
    • https://vectorcorp.net/sites/default/files/webform/resume/danodajanenalidadalibebav.pdf
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/mimixinaxeralowevowijut.pdf
    • https://ambrose.edu/sites/default/files/webform/juremetepatofuf.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/65810703597.pdf
    • https://vectorcorp.net/sites/default/files/webform/resume/dofivefodazewinewes.pdf
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/tekuxegejarikuferibo.pdf
    • http://www.birdlifebotswana.org.bw/sites/default/files/webform/sightings-sketches/fipeforivu.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/24974410021.pdf
    • https://europa-ts.ru/sites/default/files/webform/81905598419.pdf
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/95133977644.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/geguridafaj.pdf
    • https://www.uts.cw/sites/default/files/webform/tizodakemepegipupimegoxi.pdf
    • http://portal-mysigma.com/system/files/student-proof/47432021317.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=joindre+pdf+dans+word
    • https://gradfutures.princeton.edu/system/files/webform/xafuzekimizitigemuseli.pdf
    • https://drones.princeton.edu/system/files/webform/zifogisabivaloxigisosobu.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9f2.bin
f8d38078ac7ae7a39159062448bc8ad404926ca5b8877bf7000d19d1f0700d0d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F2 4792 bytes