Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc819321efdb3e1…

MALICIOUS

PDF

84.5 KB Created: 2021-09-10 05:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: add99bed569cdcaf8de8430e6ff950f4 SHA-1: 3a345615e4481fdb3e66a41d713317b883777f61 SHA-256: 5bc819321efdb3e104e6e8dd94fcba08e0f50fd0fb697d532fc56cb268c4a3a5
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous external URIs, many pointing to PDF files on disposable or unknown domains, strongly suggests a phishing or malware distribution campaign. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5823

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://saint-party.com/media/file/senonokej.pdf In PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44919491968.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/sipuga.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/gugimikufozigoneki.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/kaxon.pdfIn PDF document text
    • http://moneymaker-gold.de/files/46366837395.pdfIn PDF document text
    • http://lovesenergy.nl/file/3233806720.pdfIn PDF document text
    • http://tai-group.com/upload/files/tobojeligoxaj.pdfIn PDF document text
    • http://langmypham.com/luutru/files/13582995838.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/ralasexebifawuwilikesegu.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613434a52bceb---dujusupuf.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/44029827151.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/17909652719.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210906122746304.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/46042298273.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/20850593334.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/32111752216.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/dojewolovitagetiwa.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/rosulifenimavebe.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/77080854785.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/90369642084.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/38661907407.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/gogufepaxepunogabo.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/89984292391.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+da+vinci+code+book+pdfPDF 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_off00010b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B87 21568 bytes
SHA-256: 3c95f9adf9a21e94f230287f4cbf1df5ba511a6f416728e3647d420bf8602e51

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