Malicious PDF — malware analysis report

Static analysis result for SHA-256 3755f327f717a6aa…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 19:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 87b4f4a3d75c993e998cf4cfba92642d SHA-1: 1bd915d2842208d7b304deeda5415f747923f54a SHA-256: 3755f327f717a6aaace17127f6c9c71f980ede7f907f93da1fab10dac40aabef
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a high number of external URIs, many of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://huntic.ru/uplcv?utm_term=watch+mortal+kombat+2021+123 PDF link annotation
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/80363567390.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16133dca301672---17772365726.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/rodujuzi.pdfIn PDF document text
    • http://deauville.ru/files/file/49791443071.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/29753084161.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/tinovifevuvavulev.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/kabupapeviku.pdfIn PDF document text
    • http://agavietnam.com/img/files/1492687437.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/danuta.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/soroxowikiwiwa.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/79779055883.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/ragininavumodupov.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/36204877727.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/32428978440.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/90492350316.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/vaberusiwerejuvedoredemuv.pdfIn PDF document text
    • https://haidangpc.com/contents/files/79287744594.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/73646664773.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/41701921779.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/fedonuxavugaditepojov.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/14250225467.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/wajakunigibetuwatagun.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_off0000db80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF392 18360 bytes
SHA-256: cbfbdd53412e81829a0d6a89560dc979ec75b1108ec29a30b89962b08a2a62e1
font_02_sfnt_off000123d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D6 10688 bytes
SHA-256: 47b648078463253f7309757398e75b5a7045ae37e73df2354b20e691342532c9

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