Malicious PDF — malware analysis report

Static analysis result for SHA-256 963e599d39ed52b8…

MALICIOUS

PDF

66.6 KB Created: 2021-04-09 18:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7f80b4a00e88b751b01e01623dc533a SHA-1: f85d008236b8813a9b91d0d92366336e4c5f3825 SHA-256: 963e599d39ed52b8f44b493ecc1b2785d713670951c460eb31f1bab3a1b2f4f3
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, designed to redirect users through multiple benign-looking URLs to obscure the final malicious destination. The document body, though heavily obfuscated, contains references to 'Sunken pyramid guide' and 'wkhtmltopdf', suggesting a lure to a potentially harmful resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8125

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://russian-ice-spb.ru/sites/default/files/webform/files/77599308563.pdf
    • http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/37570077738.pdf
    • https://vectorcorp.net/sites/default/files/webform/resume/tefofavokalozigukar.pdf
    • https://architecturaldesigninc.com/sites/default/files/vudezuluxi.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/wibojamivumararevede.pdf
    • https://www.jsif.org/sites/default/files/webform/nozixedexifanozavarojiro.pdf
    • http://www.sumnercountyhospital.org/sites/default/files/webform/72664382884.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/58607877977.pdf
    • http://www.pbttphtk.gov.my/sites/default/files/webform/31626011693.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=sunken+pyramid+guide
    • https://www.vub.be/sites/vub/files/webform/43319512550.pdf
    • https://lib.asu.edu/system/files/webform/53252105934.pdf
    • https://printandmail.princeton.edu/system/files/webform/ziwilijevugibapuvoboka.pdf
    • https://www.vub.be/sites/vub/files/webform/fazarixi.pdf
    • https://minorsoncampus.princeton.edu/system/files/webform/posilo.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e41c.bin
5e0a262c4ca2f3380dfd6804429e23eca212d4cbf392c5b7e1aeef22a09a9f57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE41C 5340 bytes

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