Malicious PDF — malware analysis report

Static analysis result for SHA-256 9369b211ff0ff9e6…

MALICIOUS

PDF

75.2 KB Created: 2021-09-24 22:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e92b32ac2cace70424a8b26ca97dc4c SHA-1: 3876ac4564856bb8d7a4d28f90bb2f1b884d3597 SHA-256: 9369b211ff0ff9e6d377c96039476822796ba4b4876e104329c65fa9b0c3c631
134 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://krisoc.ru/uplcv?utm_term=how+to+save+phone+memory+to+sd+card
    • http://ildungrice.com/fileupload/fckeditor/file/solelusobifiv.pdf
    • http://nagakuratrading.com/js/upload/files/96997699811.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614806f3e5623---wigovawozowe.pdf
    • http://arablift.net/userfiles/file/mupekejo.pdf
    • https://esprimagroup.com/userfiles/file/pagupudako.pdf
    • https://lensprovn.com/ckfinder/userfiles/files/wagififufobadafusitififi.pdf
    • https://ganganagardentist.com/userfiles/file/dosefabubasepimazakit.pdf
    • http://godsownproperties.com/userfiles/file/dakuveji.pdf
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/7847509947.pdf
    • http://gardens-spa.com/user_pict/file/wejumaja.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/d7c7713c9a71b65fc009c537e8928271/kuzorumabofaverusoxupites.pdf
    • http://twozonechickenlasvegas.com/uploads/files/55393299372.pdf
    • https://fajndoktor.cz/images/file/files/xobuguwozusipixuduxes.pdf
    • https://cafemocion.com/userfiles/file/rerunibuzan.pdf
    • http://biirbeh.mn/images/content/file/xuguguwawamutemun.pdf
    • https://kenhquangcao.vn/uploads/files/wutub.pdf
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/22794660106.pdf
    • http://mopi.eu/ckfinder/userfiles/files/gogafexufofid.pdf
    • http://dietgame.net/admin/fckeditor/data/file/20210904095131.pdf
    • https://armenia4d.com/contents/files/jabojisare.pdf
    • http://shijijiaming.net/filespath/files/20210904132249.pdf
    • http://hiroi-es.info/yamituki-n/uploads/files/23557899116.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000beef.bin
0a21aa45aee18cc4b8b2cf0da6f93796530d127940bc95a40e5a554537d30d56		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEEF 10900 bytes
font_01_sfnt_off0000d801.bin
3132cb2b6259da32956a9401b1da551cdb373be6f5b764bd07ce08db5dd2b7a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD801 18376 bytes
font_02_sfnt_off000106ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106EA 16792 bytes

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