Malicious PDF — malware analysis report

Static analysis result for SHA-256 4633eab22396213b…

MALICIOUS

PDF

73.4 KB Created: 2021-04-11 17:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 651479bbae6d812bf9b1122c81755489 SHA-1: 01cbae80e9ff12e6a5e7614a41d810dc9a1a2f25 SHA-256: 4633eab22396213b1cf654b80df37a8fca4e7259c11709538d16bd44112527e3
124 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to unknown domains, suggesting a link farm or redirection mechanism. The document body is heavily obfuscated and unreadable, but the presence of multiple unknown URLs strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8321

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://spotlight-sites.com/sites/default/files/webform/4279473489.pdf
    • https://www.uts.cw/sites/default/files/webform/xewaz.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/21555212736.pdf
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/30253637425.pdf
    • https://www.mainephilanthropy.org/sites/default/files/lipedoketuparukol.pdf
    • http://seiary.com/sites/default/files/webform/rec/6045441545.pdf
    • http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/72246142748.pdf
    • https://www.dgs-interparts.be/sites/default/files/bipaxuvimul.pdf
    • http://www.pbttphtk.gov.my/sites/default/files/webform/1232685222.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=black+chi+poo
    • https://ubmemeaensoprod.s3.amazonaws.com/ifsec_international/call_for_papers/2021/03/33404153997.pdf
    • https://minorsoncampus.princeton.edu/system/files/webform/wetesagepe.pdf
    • https://lib.asu.edu/system/files/webform/46247033309.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcd3.bin
d2f51b7c4c2faec05847774c1e5f457d9b49f81184cc43da7be1a43f90b3c13c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD3 4860 bytes

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