Malicious PDF — malware analysis report

Static analysis result for SHA-256 f607fd8a43105552…

MALICIOUS

PDF

62.9 KB Created: 2021-04-24 10:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2aa89235e9b6ea9aa9f3fa34f53216e6 SHA-1: f9cb9e7e3018bece30fd32087feb5352d46eedef SHA-256: f607fd8a431055529ca687d0490ba9674362c9c7a6eca3916e76a1c3890b4fcd
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8119

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.natsihwa.org.au/sites/default/files/webform/72917344941.pdf
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/78191676466.pdf
    • https://www.natsihwa.org.au/sites/default/files/webform/setafemamuf.pdf
    • https://www.uts.cw/sites/default/files/webform/58994315224.pdf
    • https://ambrose.edu/sites/default/files/webform/71027525942.pdf
    • https://aboss.by/sites/default/files/webform/8474239295.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/dekif.pdf
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/tekuxegejarikuferibo.pdf
    • http://www.grotekeukens.be/sites/default/files/webform/gmawards2018/dufadurelabakugozuku.pdf
    • https://ambrose.edu/sites/default/files/webform/sudelo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=tissot+t+touch+change+time
    • https://minorsoncampus.princeton.edu/system/files/webform/tuvoluxasivawujunaz.pdf
    • https://campusrec.princeton.edu/system/files/webform/rilawadabovoxilezevateg.pdf
    • https://ubmemeaensoprod.s3.amazonaws.com/ifsec_international/call_for_papers/2021/03/pitoripizebareko.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbba.bin
cb6ed0580ab0297b68c2433bbdf8076a42b9102c34cd11e60c81062b7983e90a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBA 5036 bytes

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