Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a0b745051c61aa…

MALICIOUS

PDF

69.1 KB Created: 2021-09-21 08:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee547eee6ba53e0f8bb179f8592c4246 SHA-1: 6e70765c46eb9f0275c32c92ecbafeacdd903503 SHA-256: 90a0b745051c61aabd0f175726e341546d7058bef6bcab2ae7c1dce8adf0fb3d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to one of the numerous external URLs found in the document, which are often used for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://asavn.vn/uploads/userfiles/files/71462330088.pdf
    • http://uforoi.com/app/webroot/uploads/files/jerupizusemapu.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161452cb9a2996---gamumus.pdf
    • https://www.utn.ac.cr/sites/default/files/files/nuzutixoxekodo.pdf
    • http://studio5r.com/userfiles/files/29039693685.pdf
    • http://factory-01.com/js/upload/files/merikolovamofunuzoxepuru.pdf
    • http://torby.kbo.pl/ckfinder/userfiles/files/xitenokipu.pdf
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/besatotewaxipevokave.pdf
    • https://fenicia.uy/fenicia.com.uy/uploads/files/kazemuzamamedumisasan.pdf
    • http://0vote.com/ckfinder/files/nemoporogupixoxakajof.pdf
    • https://msiutilities.net/documents/55460657258.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/85393969a7a41b905046b30d0cbe9c2c/kegajikiluwitiwikimewasi.pdf
    • https://jkmart.net/FCKFiles/File/tejikejizefejizafirato.pdf
    • http://synphabase.ch/upload/file/50617021881.pdf
    • https://nbretail.com.vn/ckfinder/userfiles/files/89233822186.pdf
    • http://imailbox.nl/images/uploadedimages/file/288560338.pdf
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/48926604072.pdf
    • https://yasacompany.com/upload/files/15855309699.pdf
    • https://responsible-tourism-alliance.com/content_file/files/kufako.pdf
    • https://rdsdealers.com/ckfinder/userfiles/files/banenadimu.pdf
    • https://albertscience.com/ckfinder/userfiles/files/bizaweridunaxafar.pdf
    • https://asken.as/bilder/file/bimiw.pdf
    • http://studiotecnicoligioni.com/userfiles/files/sexevunelemolelumigiz.pdf
    • http://studiogaleazzo.eu/userfiles/files/41146532283.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+turn+off+data+apps+on+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b260.bin
fbaee7f8d9d694325fd2dbbedeea82de128ab3aa8e635612188f023705f00393		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB260 10488 bytes
font_01_sfnt_off0000ca55.bin
993056832867762877a9d102a61e638b03076b6cae175ea6aaa714192d259204		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA55 14652 bytes
font_02_sfnt_off0000ee95.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE95 16792 bytes

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