Malicious PDF — malware analysis report

Static analysis result for SHA-256 546667f7f37b5e8a…

MALICIOUS

PDF

70.8 KB Created: 2021-09-16 13:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4456a67140e6e5af67ff00365b25ed37 SHA-1: 19b981a6377eddc3233f31d1009ce4f934676893 SHA-256: 546667f7f37b5e8afa90c07d6c1836be703dfce92f165c8570bf46fd18dc1982
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a large number of external URIs, many pointing to potentially disposable domains, suggesting a link farm or redirection mechanism. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/acf0b60558f6d03705f323674b039289/tajijoxejodebarino.pdf In PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/zulexuza.pdfIn PDF document text
    • http://ruihuitax.com/files/file/42432048339.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/sulegapi.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/wuruvobanamepag.pdfIn PDF document text
    • http://cloverdiamond.com/file/77903047453.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/filufemoturodi.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/wogiwikiroladorukisof.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/lugojexivupenusef.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/xegapozemajomub.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/p6k7jahk9hrakk3tg84p3viuei/bijowapagogitapupoxoluvap.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/fapolug.pdfIn PDF document text
    • https://franchiseinnovations.org/broker-site/files/files/66573811610.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/sufinevixinof.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/35304242528.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/penazeve.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/71397566150.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/matotuxiweta.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/kuwuzifodedoxure.pdfIn PDF document text
    • http://sb-78.ru/files/file/turopumadamar.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/navukunifewobatalagij.pdfIn PDF document text
    • https://citytrafik.nu/images/file/naxuzo.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/47224980844.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/zuvidifegitudupalinajux.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/23560421379.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=human+eye+wavelengthPDF 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_off0000b953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB953 14756 bytes
SHA-256: 4aefea0f51147f52f8980fb236b1117e6fd9ea427695fb2cd9cfb906329aa01e
font_01_sfnt_off0000de9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9D 10432 bytes
SHA-256: 4e8ee36b2a6ac59b482e316227172665c7ed02ffae625f7d28b91668325f8332
font_02_sfnt_off0000f614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF614 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1