Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc87578738dffe95…

MALICIOUS

PDF

58.5 KB Created: 2021-04-20 12:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 634cb6b5eb458a18436449a5c4bfc452 SHA-1: fd99daae8d8e72307c1445a1756d192828796762 SHA-256: bc87578738dffe95c3f6d4bf52ed075500f99435a44fdfa70f6d6fd6e755453f
64 Risk Score

Malware Insights

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

The PDF document contains numerous external links, flagged as a link farm on disposable hosting, suggesting a malicious intent to redirect users. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded URIs point towards a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 3

  • 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/bukitonixoravutewoluba.pdf
    • http://pilgrimland.com/sites/default/files/webform/resume-uploads/jokefogebefuzifuzew.pdf
    • https://vectorcorp.net/sites/default/files/webform/resume/86303695333.pdf
    • https://web.liderpapel.com/sites/default/files/webform/36759883892.pdf
    • http://www.pbttphtk.gov.my/sites/default/files/webform/3018222411.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/41266633523.pdf
    • http://www.grotekeukens.be/sites/default/files/webform/gmawards2018/41850888982.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/14219433733.pdf
    • https://www.uts.cw/sites/default/files/webform/89737617204.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+find+displacement+direction
    • https://community.princeton.edu/system/files/webform/setokan.pdf
    • https://minorsoncampus.princeton.edu/system/files/webform/libovonudipiguriteg.pdf
    • https://community.princeton.edu/system/files/webform/putirufulexuxibo.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d509.bin
d35b5773b2a0bfa12fee57491b45532064cef1a1e9e5e11224fa005ad8587512		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD509 5356 bytes

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