Malicious PDF — malware analysis report

Static analysis result for SHA-256 d77ed51facfe55d8…

MALICIOUS

PDF

75.7 KB Created: 2021-09-26 21:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a073fce50a402484c91fb3ecf3987b29 SHA-1: 46fe4c78379948a4f86018d4d51dc14e0715c2d5 SHA-256: d77ed51facfe55d85ac9ec141f35d2f8e7755be185bbadfa78468a2c9fd2f0b1
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 hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript (T1059.007) suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://studiopol.com/userfiles/files/bozopidulemoviverupalijig.pdf In PDF document text
    • http://energywork.pl/userfiles/file/bipovifamugur.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/73696116300.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/80000997580.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/wefudibibewaraj.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/jojeruxuxuxelexosonupopuz.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/69489145535.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/nulokujibob.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210917200233.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/tabobukavot.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/6541187546.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/jomejajereluromeratemegu.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/sutegiwimiziwopodakesuw.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/959e7264c7a7db8796f91174e843b5f4/17386131920.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/legovilomuvofojufides.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/wotufijowudizezepuvon.pdfIn PDF document text
    • https://mavibusiness.it/file/34218874947.pdfIn PDF document text
    • http://rsst77.ru/upload/files/64339664136.pdfIn PDF document text
    • http://adm.stikom-db.ac.id/js/uploads/files/53485758195.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/8926581807.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/varabopuka.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/62529105867.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/lunopo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=my+hero+fillerPDF 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_off0000c10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC10D 19288 bytes
SHA-256: a20302b140c9379640b32cd6c399dbef641b0976e1b51f79a47f878bd819797c
font_01_sfnt_off0000f39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB4 9884 bytes
SHA-256: 655ca3838238fd1cec5847745cbb4c187ad70d88d4fd61e64dd7e5a3f6568b2d

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