Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e24ec28924c33f2…

MALICIOUS

PDF

86.4 KB Created: 2021-09-13 19:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb9fab9e1bc02964cfc1a9e3e255389a SHA-1: 0a4b5b42a86d6954f6e30b1ed80f3c8fd231eb5c SHA-256: 8e24ec28924c33f242e14ecabe331dcef30036645bdd7669b017caa2d4641dfd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to PDF files on potentially disposable hosting, indicating a link farm or phishing lure. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://academiapreprod.riportico.com/userfiles/files/bifekepuruzezupige.pdf
    • https://valleyrentals.com/userfiles/file/busivulifub.pdf
    • http://chromavials.com/d/files/27353273361.pdf
    • http://md-servicios.com/userfiles/file/84579368971.pdf
    • http://m-camper.ru/ckfinder/userfiles/files/57644620374.pdf
    • http://transbur.ru/admin/ckfinder/userfiles/files/92394722258.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/5ffdfpav8ol3mp5fs0qsdrtqh6/39472101787.pdf
    • https://theurbanthinktank.com/files/72106181945.pdf
    • https://citytrafik.nu/images/file/39124434968.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322797ce730---21403076575.pdf
    • http://lecieldesandes.fr/ckfinder/userfiles/files/96115628352.pdf
    • http://gfzgt.ch/upload/file/87098935299.pdf
    • https://santa.sg/images/users/00000000/files/babajelu.pdf
    • https://indirimlipin.com/calisma2/files/uploads/40694544845.pdf
    • http://www.urbanwaterways.info/files/98182752189.pdf
    • https://gogreenonline.net/userfiles/image/fckeditor/file/vezonazofagazagefalasaz.pdf
    • https://jeevadhara.org/work/london/userfiles/file/15306071743.pdf
    • http://confidenzacsapagy.hu/upload/tatepubiwimeniximopusu.pdf
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/rafigegevow.pdf
    • http://kaies.net/upfiles/210908074205056619m3xirx.pdf
    • https://apartmani-mestrovic-krk.hr/files/tazelewekamajafuja.pdf
    • https://tomorrowhubs.com/upload/users/files/48845271887.pdf
    • http://cdio.vn/uploads/userfiles/file/gopenotefiziw.pdf
    • http://consol.hu/images/uploadedimages/file/muvusosuluxejoje.pdf
    • http://elitakhealing.com/ckfinder/userfiles/files/30983730188.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=high+quality+racing+games+for+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_off0000edc2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC2 16792 bytes
font_01_sfnt_off000105d9.bin
2699447f5ffa48ca81030fe28d5dc4f1e430adb53a66c75f07a049cd7656732e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105D9 11272 bytes
font_02_sfnt_off00011f95.bin
3827ef9a385999f2a0374bf86e194f6559fdd53e43f811445833ec20704c8bd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F95 17436 bytes

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