Malicious PDF — malware analysis report

Static analysis result for SHA-256 513526f60f26362a…

MALICIOUS

PDF

76.2 KB Created: 2021-09-19 10:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1f28660ba03a4d5d0760b37f47407e9a SHA-1: 865a454f8fb9935e17db1309e3bb6489e748a10b SHA-256: 513526f60f26362ae0d7ce50aff2780f81beec2016fc5570ad73d4ee5f775917
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://medvor.ru/uplcv?utm_term=ocean+of+games+pes+2021 PDF link annotation
    • https://tailormade-sales-marketing.com/userfiles/file/29794034926.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/73722507080.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/31917001967.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/ninaduji.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/robilasanususasajonubuje.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/rokinum.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/kepiditodoguruvuli.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/953k21s86ci4bhpmeaao05t7dv/tadawe.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/28399327195.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/38843726355.pdfIn PDF document text
    • https://actor-conseil.com/files/file/disedujepapivategaka.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/202198112567275.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/lumoripasomijajan.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/lelexiba.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/talagigadexa.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/70651704799.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/287657040.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/20788576695.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/pasinewitogepegitenaxupo.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/livafabeba.pdfIn PDF document text
    • http://sciattella.net/images/file/17488366087.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/gimuruxiw.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/r48b00igojjf34ln9nk39fnshk/23141577035.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_off0000c541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC541 17200 bytes
SHA-256: 9c890a450baee2c24b1c12c7104b0842c9e7c69d01f93e33176302cfbdd81ec3
font_01_sfnt_off0000f209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF209 10808 bytes
SHA-256: 2bbec0d83baaf00a56df74659c7d1f52755865c6d415f916f976a0796aaa2d38
font_02_sfnt_off00010b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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