Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b656d874d1370d6…

MALICIOUS

PDF

80.3 KB Created: 2021-09-16 13:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aba9cf0e7773c4cb95a60e91626c96bd SHA-1: 9d6a66130108c87facf971f3bb4eca73dd3c38d1 SHA-256: 9b656d874d1370d69d830e923292bac0941674b798c73b81422ba47ecfb9e73f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous 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 to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to exploit PDF vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=present+and+past+passive+exercises+pdf PDF link annotation
    • http://jjburgerut.com/uploads/files/xoxad.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021090819431369.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/melowu.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/1011841755.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/5433952149.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/94230157784.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/9034289560.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/3e9922123d9d7a7a084a57394f7dcca3/rizuminixivalubilovo.pdfIn PDF document text
    • http://pololanna.com/user_img/files/46339288720.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/lixesazonipuxizawogoweneb.pdfIn PDF document text
    • http://xycrusher.com/d/files/tevafazade.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210913163156035745.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109101001288100.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/rezoxemupozo.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/16913512294.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/96350213580.pdfIn PDF document text
    • http://shamayachts.com/upload/file/rarixufavikaxoliw.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/81403985815.pdfIn PDF document text
    • https://onlinendttraining.com/files/jumuve.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/47446786221.pdfIn PDF document text
    • http://pk.mo/userfiles/file/87348828303.pdfIn PDF document text
    • http://palami.by/images/file/luvijagamiluba.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_off0000d457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD457 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6E 10616 bytes
SHA-256: 1688b7d00e57acdf682f40e0f261ee83aac588d809bd70b4b6195a2cc0fc5fa5
font_02_sfnt_off000104e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E2 18136 bytes
SHA-256: b3366e5febfa096e64f3f6035574415c3503eeaa5354ab2b66e8f060fce17a1d

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