Malicious PDF — malware analysis report

Static analysis result for SHA-256 36c2cacb1524bca5…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 17:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08ca714cee069f24bc882e78f159734a SHA-1: 4b01a49e4c805a34cf407ba075d12aae2648e1fb SHA-256: 36c2cacb1524bca56439cc28c792636170cab6d2e0c1a287ef793bd4976f3dab
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains embedded JavaScript and multiple external URIs, some of which are part of a link farm designed to host further malicious content. The presence of a 'download button' heuristic suggests a lure to download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=hd+live+wallpapers+for+pc+1920x1080+free+download
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/85192578730.pdf
    • http://lafiestadelmoto.cz/files/file/63367025750.pdf
    • https://songhong-thudo.com/img/files/84764185628.pdf
    • http://perfect-gallery.com/userfiles/file/vapitomagawezoberob.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16144bbf8b2d46---wepopuwutudovan.pdf
    • http://proxkimya.com/resimler/files/32357156566.pdf
    • http://branonperformance.com/ckfinder/userfiles/files/11599278919.pdf
    • http://tweddlefoto.com/files_contenidos/upload/files/93497728400.pdf
    • http://tartak-monis.pl/tartak/images/file/kiwuno.pdf
    • http://krr-nfe.com/suratnfe/UserFiles/File/kijam.pdf
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/dopopexitakavax.pdf
    • https://fereshtegan.net/basefile/fereshtegannet/files/5349546079.pdf
    • http://balone.net/_upload/file///81596222063.pdf
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/15082854935.pdf
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/kuloled.pdf
    • http://beijingteye.com/upload/files/dudevusumifubosapikebep.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380bc86eb51---xotelif.pdf
    • http://loaamtran.com/files/usersfiles/files/lesabamoroxisetifapire.pdf
    • https://uslugiinzynierskie.com/eurostyl/photos/file/86465823629.pdf
    • https://elegune.net/files/galeria/files/98168713793.pdf
    • http://langyupharm.com/upload/files/lemoj.pdf
    • https://at-studio.tw/app/webroot/userfiles/files/20210912_094842.pdf
    • http://pekingtogo.com/uploads/files/pupelewogajofadimuruxena.pdf
    • 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_off0000d758.bin
ce6e27b395b40426508f51393e53481cbae25336f8d5fa0893c2884a6afa8c26		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD758 11428 bytes
font_01_sfnt_off0000f28a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF28A 16792 bytes
font_02_sfnt_off00010a9c.bin
036720dec62bac534639c57fa26aa647502a2753e44331bb30a091a57c530fc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9C 17236 bytes

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