Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f8033272e089eb…

MALICIOUS

PDF

87.1 KB Created: 2021-09-13 14:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2bd63ab5b94a0ac4772569e19ba7276b SHA-1: 2c9c46058bfa9bdfdfba693a03dc0d36766173ff SHA-256: 90f8033272e089ebaa1b1dd0fcfaff7a026469b73b2bbb133bc1aef13308fb51
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=frozen+2+full+movie+1234movies PDF link annotation
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/nowetoxumipuxomabivazo.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/tumuma.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/92733381092.pdfIn PDF document text
    • http://4bx.pl/public/file/38659689305.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/11223680930.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/vubowemumuguwijibimufezig.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/88549912862.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/87540616606.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/9389767525.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/kelugup.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///20701702087.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1613395f33176b---favelurasolemelekotad.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/rivoxupoduponeve.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/6416897571.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/xepoludesomutepigex.pdfIn PDF document text
    • https://dhrc.in/userfiles/file/sepuzivunobizidotuv.pdfIn PDF document text
    • http://weingut-suppan.at/files/37861137122.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/51711982702.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/49365752370.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/43627192068.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/radonomiworaleribuzov.pdfIn PDF document text
    • http://belv.ru/userfiles/file/15593548379.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/pixafelud.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210911_095342.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/kapadunorixatofumi.pdfIn PDF document text
    • https://doitoutdoorz.com/file/7EDw1UyDdjbk5ZLO.pdfIn PDF document text
    • 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_off0000efd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E8 10740 bytes
SHA-256: 3c364f953e7302f775667152a1a45ff9f85331a02f9a6bde4f6539ac0834c907
font_02_sfnt_off000120c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C1 17664 bytes
SHA-256: 524805dc725148b4414da4559894a7c2e1d09988c20183894956aa272a709832