Malicious PDF — malware analysis report

Static analysis result for SHA-256 49442beb0e714f16…

MALICIOUS

PDF

81.0 KB Created: 2021-09-09 20:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c1fb73e22ff084bbebfa002613f383a7 SHA-1: a53a1a2b6597ea4666dc02e909d69e9520132208 SHA-256: 49442beb0e714f1667b96b6275fb8a5f2e15b14ef7c5f004b4b4f1df48c81bc3
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a large number of external URLs, many of which are hosted on potentially disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://goldfieldssanddrags.com.au/ckfinder/userfiles/files/didumimofezaxivikaduloku.pdf In PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/97994108449.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/72492977906.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a0186ca62---12460377544.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/fares.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/nanejofope.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/dagosoves.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/didosimizarenifofiniwo.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/sezanuwezox.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/xapofup.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/65006603442.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/jobesirokozinerijigena.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/weginimevobal.pdfIn PDF document text
    • http://esistore.de/userfiles/file/96678497486.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/75168175271.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/guvumawasuxezejubabosu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/lubuvepus.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/86831065928.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210905055052.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/dolomunatuwowipagep.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/64997982181.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/zujuxixaj.pdfIn PDF document text
    • https://apra.pl/files/file/8924802145.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613897970ea72---joxogiranudirozisix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=who+viewed+my+instagram+profile+iphonePDF link annotation
    • 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_off0000d68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA5 11204 bytes
SHA-256: ad63c6de5e4c36fb8f74b3390f7ae34f0befb0ad572c3afea05bae0429e93cb8
font_02_sfnt_off0001088b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088B 17944 bytes
SHA-256: eae1b2796e1ae1c5a405cbce5ef7b6033373faa447f5cf61902b68f6eaa00914