Malicious PDF — malware analysis report

Static analysis result for SHA-256 2147a83586a931c0…

MALICIOUS

PDF

72.2 KB Created: 2021-09-30 23:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 85bbc7a9f5aef80f9e1776c1f3c218da SHA-1: 268d8682010e8d5c5e681d93a2f2a6cd989e565d SHA-256: 2147a83586a931c05e15779c877cd24607e2c8cae050a59cb66755bb2e26de12
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to suspicious PDF files hosted on various domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external resources, contributing to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b9d5d0d7e---50493281303.pdf
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/42474968149.pdf
    • https://hahapediatric.com/uploads/files/202109171422027978.pdf
    • http://fskyok.com/uploadfile/files/laxuxegezader.pdf
    • http://misr-consult.com/userfiles/file/95696229809.pdf
    • http://bhk-aindling.de/userfiles/files/jitubifavatagoramaj.pdf
    • http://laibros.com/ckeditor/userfiles/files/pusonira.pdf
    • https://srinivasagroup.com/ci/userfiles/files/69577106252.pdf
    • http://satisfytech.com/ck/upload/files/4032853543.pdf
    • https://xyoaa.org/sites/default/files/files/fexolidulizuvojiguzuvisuv.pdf
    • http://www.siscbolivia.com/admin/uploaded/fck/file/gusajabawovuravokuf.pdf
    • https://inprovitargentina.com/ckfinder/userfiles/files/lefaripakofiwomobipomave.pdf
    • http://opusbiz.kr/data/editor/file/1729590270614d75349cf39.pdf
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/paluvedupibigupavuboli.pdf
    • http://glassick.com/userfiles/file/bokanerutosuwaposoxegakiw.pdf
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/86287685514.pdf
    • http://primebrokeragetx.com/ckfinder/userfiles/files/xekilabot.pdf
    • http://ahkjt.com/upfile/file/dofoxufevenamunibenegagod.pdf
    • http://ombs.ru/uploads/files/wizopubisomumovanasog.pdf
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/98445318102.pdf
    • http://msinziniering.com/userfiles/file/penisigekakufelita.pdf
    • https://chineseclothingonline.com/File/bipiritulisakixilove.pdf
    • http://tmkb.org.tr/ckfinder/userfiles/files/zoboxesekijovalulabub.pdf
    • http://bandbaajabarat.com/ci/userfiles/files/7406355974.pdf
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/27338605536.pdf
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/84204454820.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=android+kalender+outlook+synchronisieren+ohne+google
    • 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_off0000b49c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB49C 16792 bytes
font_01_sfnt_off0000ccb3.bin
b5389b187e7d8d88ad9da1d0641aec675955c702585d16c006036f82e0f7fb65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB3 10936 bytes
font_02_sfnt_off0000e5d1.bin
a922e4fe1753dc7b5fb7d61244d9d1f7503fc412fa86a4a85d684039b5bc8132		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D1 17596 bytes

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