Malicious PDF — malware analysis report

Static analysis result for SHA-256 15517d52f4ac9bd7…

MALICIOUS

PDF

70.0 KB Created: 2021-09-16 18:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 91ca26447a4f51cf480e26cc072fd45f SHA-1: 455791cc3dfc48f901defeaa7915171f41efb87d SHA-256: 15517d52f4ac9bd77ac3bb8c6b11c42664f1d5149e5e6a41872a86e4e7393293
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious sites or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, pointing to numerous distinct hosts, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://vevo.keresztessyoptika.hu/elemek/file/biguwixelofer.pdf In PDF document text
    • http://wccflooring.com/userfiles/files/godavuvorolaxa.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/54653610298.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a02fb17b93---lewujo.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/78321373607.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/bawirojumu.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/zuxurofutadugufod.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/papoxenoxomiwawokukaluw.pdfIn PDF document text
    • https://harmony.im/userfiles/file/zagososigupipag.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/67512324049.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/vubaparizodorobop.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49794918068.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210902_9A194901B924E69A.pdfIn PDF document text
    • http://htwy.com/upload/file/guboxupexufuzabin.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///43910121301.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/47984210917.pdfIn PDF document text
    • https://mklaassen.nl/images/file/3045036161.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/nc46d79e7almeu3t2an7glimq2/66179227008.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/30509703717.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/lekimewasewitufedip.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/toziwawojozuzurovegu.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/wuwilikanejubutojorebopan.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/26147481952.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/75754166169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=watch+full+bollywood+movies+online+freePDF link annotation
    • 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_off0000b126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB126 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC938 15288 bytes
SHA-256: ed74e96ac4bb6885f85d2ed02ba1d235b76af6335bfffb2e27c321555cfca608
font_02_sfnt_off0000f005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF005 11240 bytes
SHA-256: 544ad0b60f7ac3fd16e49656c70f8ca96628224a1264a658f66a47b4019166fd