Malicious PDF — malware analysis report

Static analysis result for SHA-256 75422d19047bb67c…

MALICIOUS

PDF

85.0 KB Created: 2021-09-18 21:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0fa44d50f1e4ef333f82bb7c7ae0f945 SHA-1: 3c5a85cb0af8a1c6427f3b07976e8c66bb3a500a SHA-256: 75422d19047bb67c759b77add69a11a239e0a732a13f40ab664ab6574e330892
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is intended for malicious redirection or phishing. The presence of embedded JavaScript suggests an attempt to execute code within the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://exam11.menapoint.com/app/webroot/upload/files/vedozopujejatozam.pdf In PDF document text
    • http://iscelenie.info/files/file/fosuzidululonojufix.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/difomufasadepagis.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/33476164851.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-11/20210911212627313219.pdfIn PDF document text
    • http://xinge168.com/uploads/files/20210906031350_812632.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/51262570778.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/tatekobulasupa.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/84778815531.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/39690918915.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/45082711923.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/67420174545.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/kepiviv.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/ludas.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/95185263565.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/69045902124.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/rugevizi.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/xudelubos.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210903155644135.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/2167854785.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/tosedagejilozukedejuteg.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/zutufanufuvutapaji.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/takebegunibikab.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/suxomisenokekiwal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=best+free+audio+editing+app+for+android+freePDF 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_off0000e89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AE 17204 bytes
SHA-256: 8a03068ab47cce302810d08278863efb969155772ead40ee6eb59be2b78fd432
font_02_sfnt_off00012d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D38 10780 bytes
SHA-256: 65dc5e69ae410789b5032fa40f95929c68e1d398c2e8896e3fe83ca3261f3fc3

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