Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6bf31b8b9f7394b…

MALICIOUS

PDF

80.5 KB Created: 2021-09-20 13:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ef4342d7523dcec5a485a1545b1ac917 SHA-1: 080414aad135e0de95ccc240f3a7efae6e4dae8c SHA-256: c6bf31b8b9f7394ba2a62f3f9eaf791faa7e0c74247c625cc08dcf53f6354fbb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=mlp+fighting+is+magic+apk PDF link annotation
    • http://e68momo.com/shopadmin/upload/files/pomupi.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/27091476531.pdfIn PDF document text
    • http://full814.com/upload/files/kafilinuverapawi.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/xovakenu.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/mugor.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613008773e20d---23117925273.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/49785055866.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/sikafir.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210909065957_2070884096.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/dukak.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/23582760909.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/xilazaxemi.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/69618313407.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/91393790208.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/10746514683.pdfIn PDF document text
    • http://chayka-svg.ru/files/xizufusiginasulo.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/malelogativawepimixobikal.pdfIn PDF document text
    • https://labelmarket.pl/data/file/pejaperakewapedopuximoxog.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/73677470568.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f4ab0b483---27092632091.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/witomagewewad.pdfIn PDF document text
    • http://stl-hk.net/userfiles/zulakoneg.pdfIn PDF document text
    • https://limsurempat.com/contents/files/kufafasuzoratevaguka.pdfIn PDF document text
    • https://norservis.info/files/files/xofugulejekipazagi.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_off0000d806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD806 17012 bytes
SHA-256: d924d32986219fc37cfa170370a55259bc3f369795125a706826094bf0a930e1
font_01_sfnt_off000103fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FD 10660 bytes
SHA-256: ea485074dc1e03a0ba31f14213850463fe664e44540c5b06eed5b4ce7fa0291e
font_02_sfnt_off00011c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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