Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ac66aad6ee99e6…

MALICIOUS

PDF

62.4 KB Created: 2021-09-27 20:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3d1c35b2313942bf38a455c46e6c344e SHA-1: b3acbb9f7cc2131995529649b0be0f6d67608813 SHA-256: b8ac66aad6ee99e661f3be4748868f1972563c133d4ec5f2893ff85e9ff93289
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. The document contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of external URIs and the overall structure point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6567

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://infrive.ru/uplcv?utm_term=online+game+imposter PDF link annotation
    • http://goref.ru/files/file/wegikavagutixifupimujiva.pdfIn PDF document text
    • https://kuepancong.com/contents/files/81612487572.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/vikozetozisivejunido.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/razonet.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/92129046758.pdfIn PDF document text
    • http://batistar.fr/userfiles/file/xudofe.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/pozidevilotiginadawodelu.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/vawizidiwujuguvitapaxopom.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/77993376514.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/sefasuruxumumisosemuwez.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/83122445970.pdfIn PDF document text
    • http://teplospectr.ru/images/files/40419450917.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/18835204643.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/48557188019.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210903_4FA5DD87ED2AD002.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/1541566886613ce65d6b322.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161407e941ee0d---dowadunaxe.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/wakataga.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/xiwudijetemeku.pdfIn PDF document text
    • http://rubensova16.cz/files/file/53743508344.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/12673055487.pdfIn PDF document text
    • http://mestan.by/images/file/vajozu.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/merib.pdfIn PDF document text
    • 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_off0000b090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB090 17744 bytes
SHA-256: a6f6a514e31ce7afafa92a9220240ca0473acb3cb979cfe60e2e408b4538862f
font_01_sfnt_off0000ddce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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