Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca61b760a82c666…

MALICIOUS

PDF

57.1 KB Created: 2021-04-25 22:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f83ca7cc4de01b0bacd19f96677a8f4 SHA-1: 808bc8033c46e14bd86d7bdcf52e43b9417598b4 SHA-256: 0ca61b760a82c666f3ed54d1d0c39b09ccfb5c7f72df3e198b20889238a6eac4
124 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit users through deceptive content and links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9697

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.jsif.org/sites/default/files/webform/meratasadif.pdf
    • https://www.a1touchsolution.nl/sites/default/files/tarutemivejumariwara.pdf
    • https://www.afscme65.org/system/files/webform/96479551545.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/buvonajevomowetizebijix.pdf
    • https://www.natsihwa.org.au/sites/default/files/webform/welukugipevodabarovefeweb.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/jowodudarazobipadumalo.pdf
    • https://ambrose.edu/sites/default/files/webform/bunovodedodasu.pdf
    • http://www.sumnercountyhospital.org/sites/default/files/webform/27017481005.pdf
    • https://www.mothercare.ro/sites/default/files/webform/resumes/sojivezogi.pdf
    • https://ambrose.edu/sites/default/files/webform/sudelo.pdf
    • https://ambrose.edu/sites/default/files/webform/11118021720.pdf
    • https://www.a1touchsolution.nl/sites/default/files/87400145234.pdf
    • https://aboss.by/sites/default/files/webform/12132802610.pdf
    • https://vectorcorp.net/sites/default/files/webform/resume/86303695333.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=does+dunkin+donuts+flavored+coffee+have+carbs
    • https://ec.europa.eu/eip/agriculture/sites/default/files/webform/77241298986.pdf
    • https://ubmemeaensoprod.s3.amazonaws.com/ifsec_international/call_for_papers/2021/03/woragirewun.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d77c.bin
967b7e5dc625251ed6136057b9138e47a241f1a3db1ec6aa1f993b3be45fda55		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD77C 5372 bytes

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