Malicious PDF — malware analysis report

Static analysis result for SHA-256 a94f83426b4b6c94…

MALICIOUS

PDF

63.7 KB Created: 2021-04-16 03:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64d7880b52378250bb527d735df8e731 SHA-1: 4f9b9041a1516e720fbd05caa8d17dcabc4e8dd6 SHA-256: a94f83426b4b6c940dc31ba0d2bf4c138c9543dacd0a2a45fb2cbae531f74b57
124 Risk Score

Malware Insights

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

The file is a PDF document that contains numerous embedded URLs, many of which are hosted on suspicious or disposable domains. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily garbled, contains references to 'drivers samsung scx 3405 para windows 10', suggesting a lure to trick users into downloading malicious files disguised as legitimate drivers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8599

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://extranet.blanchisserie-toulousaine-de-sante.com/sites/extranet.blanchisserie-toulousaine-de-sante.com/files/documents/justificatifs/ziseriwutekezarog.pdf
    • https://web.liderpapel.com/sites/default/files/webform/53484808665.pdf
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/78191676466.pdf
    • https://www.a1touchsolution.nl/sites/default/files/87400145234.pdf
    • http://pilgrimland.com/sites/default/files/webform/resume-uploads/woluweweketasuzizolog.pdf
    • http://portal-mysigma.com/system/files/student-proof/pifudolaloxafedotodela.pdf
    • https://www.jsif.org/sites/default/files/webform/rijuluzevowogadabiwi.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/nunemoxajusadokuxilebe.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/gurasijam.pdf
    • http://pilgrimland.com/sites/default/files/webform/resume-uploads/tixatikuwasa.pdf
    • https://www.dgs-interparts.be/sites/default/files/68462010443.pdf
    • https://ambrose.edu/sites/default/files/webform/28695523124.pdf
    • https://www.jwico.com/sites/default/files/webform/71926652616.pdf
    • http://www.grotekeukens.be/sites/default/files/webform/gmawards2018/98751459569.pdf
    • http://www.guninetwork.org/system/files/webform/heirri_proposals/35039450578.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=drivers+samsung+scx+3405+para+windows+10
    • https://printandmail.princeton.edu/system/files/webform/60959229638.pdf
    • https://printandmail.princeton.edu/system/files/webform/mizol.pdf
    • https://www.vub.be/sites/vub/files/webform/43319512550.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8fc.bin
6fd2f843edd8dcd144c3a07b2b36c457329ecfce5c0fb1be9f5f65b93cc39020
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FC 6152 bytes