Malicious PDF — malware analysis report

Static analysis result for SHA-256 45854fad67b0ae00…

MALICIOUS

PDF

71.8 KB Created: 2021-10-04 05:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0e32dbcbe0074cbcdca00e4b62a30bcf SHA-1: d03d2cee621e7558248b017bcf168d83449047bb SHA-256: 45854fad67b0ae00a8ac74c3a8b44e70fbd4258df0b018a91d375d4b0d486209
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with a high ML classifier score and ClamAV detection indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the embedded links lead to a link farm, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://lex.tj/img/file/sekolubuxomomupirolege.pdf In PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/8ef4f55cac627daa5f5fbff1e672c295/69798157382.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/81596284777.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/gevupesedewetuk.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210929195650.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/13068641387.pdfIn PDF document text
    • http://ikansambel.com/contents/files/koxevobamuzales.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/vukunudavosi.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/rorewitapomaxu.pdfIn PDF document text
    • http://hanyuchina.com/upload/files/48227091421.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/3306228b49d2cfbd55805d68b32e056e/88896559337.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/93018119034.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/47168624305.pdfIn PDF document text
    • http://accronline.com/userfiles/file/bexilalilewedorejojet.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/37115827418.pdfIn PDF document text
    • http://ghefoot.com/fckeditor_userfiles/file/labolab.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/minedoxasu.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/70239203139.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/13466853825.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/73463097009.pdfIn PDF document text
    • http://wawa757.com/uploads/files/bofazemerosa.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/65151132491.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210911_213820.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/jiwagosenejimeviba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=can+i+eat+rice+while+dietingPDF 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_off0000b5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE08 17236 bytes
SHA-256: 616be040ab4c847b6e48e7f4c05cb7915aa6ef343542586220f557999c40f344
font_02_sfnt_off0000f9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EF 10476 bytes
SHA-256: 7f95cd54dda7786efa33adcd37a9618635e8a7343f82b8addaa9c95dde96857e

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