Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb26bbe1c334c13…

MALICIOUS

PDF

77.7 KB Created: 2021-09-16 15:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ab3fd51f8be46687c9d2ce5ff71c62b5 SHA-1: b26a7ca65b7974ea9b410b78e4edbdd0ead4fd10 SHA-256: bfb26bbe1c334c13a4316d656ce69918cb9a015f06bbee40d32a6f9860130038
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on suspicious domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8452

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 http://synerfreight.com/syner_upload/images/files/4854807297.pdf In PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/fopapuxegazedomad.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/89915906200.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/faxosotek.pdfIn PDF document text
    • http://ativn.com/upload/file/85797086918.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/xofudifokojiludokola.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16142cd2325bfe---43152967015.pdfIn PDF document text
    • http://thaide.org/userfiles/file/40427163613.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/pigisasalazu.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/jopefivosirasedaralix.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/xumelirozelu.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/55610802967.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/vewabamotebexisevox.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/19157876538.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/11759343587.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/31385156191.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021090610355877363.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/siluzigumu.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/sevonibufosenojarojununip.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/wewejulugin.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/tupuwizinitemazuruf.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/dopobitepiwimaxif.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/37020914248.pdfIn PDF document text
    • https://funke.be/data/file/76109188463.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=fake+gps+and+joystickPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD788 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9F 10856 bytes
SHA-256: 49ea3bddffbbe6e09240a775fecbd614b2a9e4f01b4cdfe9a52e4b8fb0bca6a1
font_02_sfnt_off000108a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A5 18424 bytes
SHA-256: e41bb8160db68e92aa28e9d9d7549c03c5b1963099b84ee38f218640f5c61a37

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