Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff2ea94b771c5e87…

MALICIOUS

PDF

57.4 KB Created: 2021-04-17 04:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db84b51e205c3033fe8f8498baab1927 SHA-1: af7404d47e43d992e072d435302f91cec04bf45d SHA-256: ff2ea94b771c5e871a2f374e40ff54f0f72183ab1b899856e85fac6e9602eeaa
124 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The document body, though heavily obfuscated, contains references to 'Elm327 mini bluetooth pc software' and appears to be a link farm, suggesting a lure to download software. The presence of multiple embedded URLs, some pointing to disposable hosting, further supports a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8176

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://www.woonsocketri.org/system/temporary/webform/51053607868.pdf
    • https://www.dgs-interparts.be/sites/default/files/42042694998.pdf
    • https://www.natsihwa.org.au/sites/default/files/webform/tuwagamutavuvefofufeniz.pdf
    • https://www.jwico.com/sites/default/files/webform/71926652616.pdf
    • http://pilgrimland.com/sites/default/files/webform/resume-uploads/69774832497.pdf
    • http://pilgrimland.com/sites/default/files/webform/resume-uploads/pakajumotarowumomudiro.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/604022749.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=elm327+mini+bluetooth+pc+software
    • https://ubmemeaensoprod.s3.amazonaws.com/ifsec_international/call_for_papers/2021/03/wutiladerotegedubel.pdf
    • https://gradfutures.princeton.edu/system/files/webform/pelafo.pdf
    • https://gradfutures.princeton.edu/system/files/webform/48950823745.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2d8.bin
2e75c93d3704245de40ea77f369deda4623b9d285f70fe335e4ac789efe48211		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D8 5820 bytes

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