Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae585ef4b56da2af…

MALICIOUS

PDF

64.3 KB Created: 2021-04-18 22:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: fb97bf27aad8c8a4ef8908ab065065f4 SHA-1: aae426f2a6f67365dd9f61650c28f80accbb59a4 SHA-256: ae585ef4b56da2afeb23a04cdc3fa49609cd3208c2d8cfea329b9b8234fe76c5
124 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are hosted on domains that appear to be part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9148

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://pilgrimland.com/sites/default/files/webform/resume-uploads/2923424149.pdf In PDF document text
    • http://spotlight-sites.com/sites/default/files/webform/loboje.pdfIn PDF document text
    • http://oaklandchildcare.org/sites/default/files/webform/55178968397.pdfIn PDF document text
    • https://www.jsif.org/sites/default/files/webform/54250685962.pdfIn PDF document text
    • http://oaklandchildcare.org/sites/default/files/webform/65810703597.pdfIn PDF document text
    • https://www.blplegal.com/sites/default/files/webform/julojulixizegusu.pdfIn PDF document text
    • http://cicatsalud.com/html/sites/default/files/webform/25507329945.pdfIn PDF document text
    • http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/2944445507.pdfIn PDF document text
    • https://ambrose.edu/sites/default/files/webform/9027254294.pdfIn PDF document text
    • https://www.natsihwa.org.au/sites/default/files/webform/doxuwekuwazomiloxeri.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=what+is+a+metaphorical+poemPDF link annotation
    • https://printandmail.princeton.edu/system/files/webform/68272747422.pdfIn PDF document text
    • https://lib.asu.edu/system/files/webform/midari.pdfIn PDF document text
    • https://drones.princeton.edu/system/files/webform/dovekilubexuvizufak.pdfIn PDF document text
    • https://minorsoncampus.princeton.edu/system/files/webform/xadumiwedom.pdfIn PDF document text
    • https://minorsoncampus.princeton.edu/system/files/webform/fujixedapilevunagujos.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDD 5188 bytes
SHA-256: e07f6f266f27fa0c48e1141bf1f9c9c01946107323782699dec5f2d6fe02385d
font_01_sfnt_off0000df62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF62 10220 bytes
SHA-256: 020216068b71da425011b69acb962cbfbaf7872027324a02298adfbbb309d6c3