Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c6df85f1588511e…

MALICIOUS

PDF

68.0 KB Created: 2021-04-17 12:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9043b8df8aa31097f93d5c84a1bc313d SHA-1: 403cfc64814605284470eee8a65669b5299fb52f SHA-256: 2c6df85f1588511ee08b22e1d89c029cc73eea59b05d87e11839b42f2a2da69f
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially suspicious domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9709

Heuristics 5

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://cicatsalud.com/html/sites/default/files/webform/jowodudarazobipadumalo.pdf
    • https://www.telluridescience.org/sites/default/files/tstc-applications/30232074114.pdf
    • https://aboss.by/sites/default/files/webform/31226501773.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/55178968397.pdf
    • https://www.mothercare.ro/sites/default/files/webform/resumes/xigidaz.pdf
    • https://www.woonsocketri.org/system/temporary/webform/danajon.pdf
    • http://portal-mysigma.com/system/files/student-proof/tevesifisota.pdf
    • https://www.mainephilanthropy.org/sites/default/files/79141676299.pdf
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/3242210986.pdf
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/34782296767.pdf
    • https://ambrose.edu/sites/default/files/webform/padubomi.pdf
    • https://ambrose.edu/sites/default/files/webform/kubuxodadiwozubak.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/zozagosetimof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+use+a+nespresso+vertuoline
    • https://minorsoncampus.princeton.edu/system/files/webform/zotatati.pdf
    • https://community.princeton.edu/system/files/webform/wijudabopijobomoxusosul.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db94.bin
fe7ff2f1fc8df321078fbf9df00b2e418f51d836251359f9d3fe8e8ee2aa5278
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB94 4924 bytes
font_01_sfnt_off0000ec78.bin
92ff7ab0ac0aa778bcea17eccefbdb5142fc16a10913441bc82aae267dc39710
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC78 10404 bytes