Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d47b05fef19190d…

MALICIOUS

PDF

64.4 KB Created: 2021-04-09 10:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d89b11a6bbd56df54b2fae718ef704b SHA-1: 62f4c8f285b960b5742fa85cbed63b8fefed500a SHA-256: 5d47b05fef19190d10a7afafdf9ac77d52fba1db5b55b0469a86c7bff2c0c9bc
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a malicious payload. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8681

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://klm3fg.grhosting.cz/sites/default/files/webform/files/vewamilobofesiwukor.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/dekif.pdf
    • http://seiary.com/sites/default/files/webform/rec/jizexatunurometubukos.pdf
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/13178745316.pdf
    • http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/37570077738.pdf
    • https://ambrose.edu/sites/default/files/webform/sudelo.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/gurasijam.pdf
    • http://pilgrimland.com/sites/default/files/webform/resume-uploads/2923424149.pdf
    • http://www.grotekeukens.be/sites/default/files/webform/gmawards2018/sakobonomoduriv.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/71502920023.pdf
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/xetomaroronep.pdf
    • https://www.cdcplumbing.com/sites/default/files/webform/contact-us/65589142167.pdf
    • http://seiary.com/sites/default/files/webform/rec/pexutagizoniged.pdf
    • https://www.mothercare.ro/sites/default/files/webform/resumes/topijetidilotifoga.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=pdf+viewer+book+reader+apk
    • https://community.princeton.edu/system/files/webform/42655509772.pdf
    • https://community.princeton.edu/system/files/webform/22535495660.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db7a.bin
c24eedfbe4ff68fce5aa57f1ae4dd8117c518b5954abd638b3e18427b4504e27		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7A 5180 bytes

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