Malicious PDF — malware analysis report

Static analysis result for SHA-256 30b51dd2b2f0798a…

MALICIOUS

PDF

74.1 KB Created: 2021-09-10 05:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b5ac45f336cb04fa39d5c1864cfa2583 SHA-1: 3fe41e9a6b35d45c0ab5a57a5bc65eda9ceb9baf SHA-256: 30b51dd2b2f0798a29ab7188780df2a6a90bc4d402bf1dbdd5922f31168884f9
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 0.9994

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 http://gaziogluenerji.com/images_upload/files/muzixulurudevopefop.pdf In PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a462169184---vuriwawafir.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16136cc80f1fc0---56838453159.pdfIn PDF document text
    • http://fmdscu.net/userfiles/file/duperamevudetolaku.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/ridibuv.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/68624054522.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/narugijosowapaxuvaga.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/leremiluximaxas.pdfIn PDF document text
    • http://orderkai.com/uploads/files/tuvuma.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/lidenefuwijusunowobuvamo.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/podejujopeduxiwozowuz.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/xoniget.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/6615582b23251a991fd7aa73695c7a89/18834585698.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/zurojomomugomujiruvik.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/wuxufajijepeberib.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/53916897823.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=win8+casino+apk+downloadPDF 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_off0000b96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB96C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD183 10556 bytes
SHA-256: f4b1d78cb9c20e0e88530024d6a018f66aa3dcf3f27c846054260dd6646d4275
font_02_sfnt_off0000e9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BB 19216 bytes
SHA-256: d01aa0565af5c42fda28ad3db19a46acb49587546ca15162ab33bf8c85d86e56

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