Malicious PDF — malware analysis report

Static analysis result for SHA-256 149c3a97209c2f89…

MALICIOUS

PDF

81.8 KB Created: 2021-09-22 14:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 576ad9726bf4cd3d6f8461641867bb32 SHA-1: 498b401480cef34f8f5f092a37b804028767ade3 SHA-256: 149c3a97209c2f8912dabb7aace4d0ff6ea9b05da9f0d1cf0ffc3339ceb52da4
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a phishing trojan by ClamAV. It contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to obscure the true destination. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are then used to deliver further payloads or conduct phishing.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3497

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://195exim.com/datas/files/36575463474.pdf In PDF document text
    • http://thrifty-uy.com/files/others/38921249382.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/d1vlq4jjivun11q3b2m25rs6m8/96617138719.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/92908501813.pdfIn PDF document text
    • http://vaynhe.com/upload/files/27068748595.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/gatomowa.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613849f6992a4---menanubujuzegixo.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/96314918308.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/26254354825.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/44491568896.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/pugeneler.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/52407480007.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/kujuxelutud.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/busuzemolupenusef.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/rifolevunenerawepixawor.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/sipiwuvejot.pdfIn PDF document text
    • http://lilipoupoli-drama.gr/lilipoupoli/js/ckfinder/userfiles/files/rapiwiletefutuw.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/vizilepaga.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/74476886052.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/tafitepapelet.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/livusawatomo.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/46359729341.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/tejajo.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///81841747571.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ambient+sound+app+androidPDF 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_off0000f52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52E 17876 bytes
SHA-256: 54ebd956b220c59cfbc73b74ac246913f23fa72b86866f28ef73c057ca543bfd
font_01_sfnt_off00012354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12354 10728 bytes
SHA-256: 5879993a8462d2c3f750ed055355ff57a9cf686295b206f69f8a2a96dbe7fded

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