Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea188922becc3e0…

MALICIOUS

PDF

76.2 KB Created: 2021-09-16 06:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 09024a7ee401310525255e61876d7e8b SHA-1: 81be5979600bb09dda849acf4629705ec4c0d756 SHA-256: aea188922becc3e07a722e26793fe038b8687fb4e5cea98da8bdd3a6f79e931a
124 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm PDF. It contains numerous embedded URLs pointing to external resources, suggesting an intent to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit vulnerabilities or trick users into visiting these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7561

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://aaaxxion.info/images/file/vivenorazafore.pdf In PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/dixeridivasize.pdfIn PDF document text
    • http://image.dlib.vn/libedu/news/bachviet/20210915/file/18090099975.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2ed8ab3f9---mupikukokixew.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/99888854978.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/pexofinodozisogepexukon.pdfIn PDF document text
    • https://sitarasign.ir/data/file/juzefigevebawumof.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/47356097918.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/nusefezodaj.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/17106267940.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/paxewalepofixaru.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/98941726772.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/87117947530.pdfIn PDF document text
    • https://dcimx.com/files/92852138461.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/70425658056.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/31615498604.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/ferik.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/kiletonapal.pdfIn PDF document text
    • https://norservis.info/files/files/26631660735.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__61331363659ED.pdfIn PDF document text
    • http://warungmimpishio2.com/contents/files/moluwanos.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/satumitisufaxotalinoza.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/9324924566.pdfIn PDF document text
    • http://frchem.cn/upload/files/23096709466.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=of+mice+and+men+study+guide+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AC 10936 bytes
SHA-256: 35d2dca5b98956ec9dff7f7a5830bbb18495e7524745429e6fd83346a02b92ed
font_01_sfnt_off0000f9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E7 18020 bytes
SHA-256: 491f2405b3fce8dc299219289ac51719de6c89cd241995b485747448a338dede