Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e0cd7ee7dd004f…

MALICIOUS

PDF

59.9 KB Created: 2021-04-07 07:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61911f97201e13f238be725a9a3b0dcd SHA-1: 89bac1758d4dca5aebeb4414e332db2a127592dd SHA-256: d3e0cd7ee7dd004f42a45e861ede14a3e8ff9aea5ea72d3b795778d34ea80681
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure for free sheet music, a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8568

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/fapulewamekunasu.pdf
    • http://www.pbttphtk.gov.my/sites/default/files/webform/74795851198.pdf
    • https://www.a1touchsolution.nl/sites/default/files/larigujumikanezazezogiwi.pdf
    • http://www.guninetwork.org/system/files/webform/heirri_proposals/35039450578.pdf
    • https://www.mainephilanthropy.org/sites/default/files/wimatetomowitiki.pdf
    • https://www.termis.org/system/files/webform/88699151804.pdf
    • https://ambrose.edu/sites/default/files/webform/20598750849.pdf
    • http://www.pbttphtk.gov.my/sites/default/files/webform/3018222411.pdf
    • https://www.jts.org.jo/sites/default/files/webform/1653940235.pdf
    • http://portal-mysigma.com/system/files/student-proof/28249136979.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/99368311749.pdf
    • http://www.sumnercountyhospital.org/sites/default/files/webform/zupusozuxabodes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=one+republic+apologize+piano+sheet+music+free+pdf
    • https://www.healthdata.org/sites/default/files/resumes/78922999772.pdf
    • https://lib.asu.edu/system/files/webform/nexeginexepor.pdf
    • https://www.vub.be/sites/vub/files/webform/gegisikirusesikogibo.pdf
    • https://printandmail.princeton.edu/system/files/webform/31356988355.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd5a.bin
3b3b017acdabe2d1a769bb9b87db3ef386f9874d76cbace69ae831b2f51c660e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5A 5784 bytes

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