Malicious PDF — malware analysis report

Static analysis result for SHA-256 00abe478bc8b38d7…

MALICIOUS

PDF

70.8 KB Created: 2021-09-15 22:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c1bf7aedb1bc969c29369790d3d5d125 SHA-1: 0a2e09386ad3a8aae659b00ffaae2764788cb70b SHA-256: 00abe478bc8b38d769af731ed2c4cb15e9b52abdfb4d425679a57894d2dda034
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The PDF also functions as a link farm, hosting numerous external URIs pointing to disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript and numerous external links strongly suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://laborke.ru/uplcv?utm_term=pharmacology+book+pdf PDF link annotation
    • https://zahidnawaz.com/UploadedImages/image/19436688846.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139133a351af---61992678231.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/temidisurisaxerabasovufaz.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/nogobusasadizaruz.pdfIn PDF document text
    • http://willajarmar.pl/userfiles/file/jinubimexasidilufasukife.pdfIn PDF document text
    • http://anpo.vn/upload/files/nivubomajelafa.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/lenewamamawabozuzev.pdfIn PDF document text
    • https://limadelimon.com/images/file/29842748189.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/guzawuzo.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/3d73f47f62918b6437a159b7eb390342/83384134123.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/digima.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/wefapuzezimuwewaweg.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/80301884216.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/dozodekanezujug.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/53061538624.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/vibovanaxosedogilaj.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/zimedarilefidafizukelin.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/9069915252.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/ropadenexalimaresiwik.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/jabizevasaf.pdfIn PDF document text
    • https://2acontractor.it/images/file/63663457933.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/82679989539.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_off0000b601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB601 10820 bytes
SHA-256: ca4648058d3a658e9cacb4cbbd595f288300a9a3b15397cfcc122e5bf19ac4a6
font_01_sfnt_off0000ce8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8B 15400 bytes
SHA-256: 5e0b981a62dc7b6cb3b636f38c2d449855ff00ed84321afde25aaa803e9ca337
font_02_sfnt_off0000f5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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