Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6497a6cd4499c18…

MALICIOUS

PDF

80.8 KB Created: 2021-09-17 13:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1057f55434a59544946c71cd5cc80a5b SHA-1: b9795bc4db39b8f7f0b584f8591764255df55b93 SHA-256: e6497a6cd4499c1853dd0f695ad2ced2f144c59982ccaa3a3dd70349bc8ca35f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous external links, many pointing to unknown domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags the use of disposable hosting and UTM parameters, common in phishing campaigns. While no scripts were explicitly extracted, the nature of the PDF and its numerous external links suggest it is intended to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://xn--atpta-nfb.lv/images/userfiles/files/makaxevin.pdf In PDF document text
    • http://phamtrangia.site/upload/files/96111814905.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/fuwufepoxeten.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/1030440039.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/67442771121.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/24126873069.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/vifolu.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/gewupipigevofubikexixoka.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/20248954339.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/wuxomenesazeraviwuze.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/sivutid.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/notufoguzigoxogafoto.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/75333445834.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16140338aa3c3e---sodogigip.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/45292444525.pdfIn PDF document text
    • https://conrays.ru/f/data/28931211545.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/3875672133.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/makenorelabesinanax.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/sarataralejiko.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/84144592601.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/23280695897.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/59852393812.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/velofezubi.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/9527857250.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=free+4k+movies+websitePDF 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_off0000d9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F4 17272 bytes
SHA-256: fe295eb5fb77cad72f81ebf8b6e3360bb3084d7b879ec48ab53c32de85a613e8
font_02_sfnt_off00011e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E26 10396 bytes
SHA-256: 0a2295cdfc4fa0a749b2aa0a2e679484590abf0608016604abc05db7498f2d55