Malicious PDF — malware analysis report

Static analysis result for SHA-256 730ff2c08fad2eff…

MALICIOUS

PDF

64.0 KB Created: 2021-10-06 19:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 985237e951c3fffbad02e620bbf06a79 SHA-1: 3dc6666fd4333236ff7200c5e686819e14a23e88 SHA-256: 730ff2c08fad2eff1e1ed222bd860c37d93113bd5527d8b62eec88a5ec8d1d73
132 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document hosts numerous links on disposable domains, suggesting an attempt to obscure the final malicious destination. ClamAV also identified this as a phishing trojan. The combination of these factors points to a malicious document designed to lure users into clicking links that likely lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8476

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://neonatal-surgery.ru/userfiles/files/78067019285.pdf In PDF document text
    • http://tythb.com/uploadfile/files/lutafade.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/lejiseta.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/76229745936.pdfIn PDF document text
    • http://xahuaheng.cn/userfiles/file/74104548921.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/13881625396.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/95456484349.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/16310066105.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/51728821834.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/ziginazupedukefimurufosik.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/jodexarepe.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/fawoduxidewetilovofinevoj.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/mapatomil.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/71808997723.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/a214da836f811e68265844b4dc339f1d/fijepukipulo.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/58227814651.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/nasare.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/18939102531.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/fokekumodigaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=cottage+cheese+onion+dipPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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