Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e5e0e3c90ce5de1…

MALICIOUS

PDF

81.8 KB Created: 2021-09-11 19:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7f2559186daf54240dd4d1db264af174 SHA-1: a3a6d107d0a78d80afd9994c9728a8567deaa4ba SHA-256: 8e5e0e3c90ce5de1170aa44463235b7a01162fb1fd34375ea4c7341b31faf710
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://coretry.ru/uplcv?utm_term=how+long+can+i+keep+cooked+chicken+in+the+freezer PDF link annotation
    • https://totalsewa.com/userfiles/file/xeveko.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/vajifefipi.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/99063728485.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/40404209213.pdfIn PDF document text
    • http://ned.ru/uploads/files/rekini.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/3814e9a613f579b9b34362af71b8f850/tojajugosegugulelurovoda.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/53872523714.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210909051533.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/futanivusituk.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/43469257298.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161383ada29e1b---zavepanujikavenomudulene.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/ranipug.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae77492403---33029115417.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/xamawologomudaroniped.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/80716412867.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/20518891486.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///61327124781.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/76861828710.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/68648589190.pdfIn PDF document text
    • http://medi-sen.com/files/files/62716527820.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/lipukuwewejodikera.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/nepefevalakaxul.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/1656132280.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/91583287846.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000db0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0D 17332 bytes
SHA-256: ce021159baa6a2f691cf82b91126d00d4a1c940e5afad62cdbff196c2d8fabd1
font_01_sfnt_off000107e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFC 10960 bytes
SHA-256: 0c73904986fbb2e2b75f573339dbfe1eb12c9b2e283c4f24cb41cfd770a726a2