Malicious PDF — malware analysis report

Static analysis result for SHA-256 4249ac03a40f96dc…

MALICIOUS

PDF

74.2 KB Created: 2021-09-11 05:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 848f50c8194cca06110561bce6820efb SHA-1: 4c13d5026ab7ad1b267722545e724b4c90e55a86 SHA-256: 4249ac03a40f96dcb1059877fab6106888480991ea5d99ef4881c02aadaac6c2
134 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm strategy. The presence of numerous external URLs, many pointing to PDF files on various domains, suggests an attempt to lure users to potentially malicious content or phishing sites. The embedded JavaScript is likely used to facilitate these redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.bordadoindustrial.com/ckfinder/userfiles/files/87960587650.pdf In PDF document text
    • https://bfull.ru/uploads/files/43805187415.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/96938258897.pdfIn PDF document text
    • https://pellevah.com/upload/files/69776049639.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/vubakekuvude.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/kekekemisifawikisixi.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/91004210717.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/zilenupelaniratatonifam.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/d6f3a85894eb7faa2b05744bcad841a4/benaxasumujenagoz.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/60952187579.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/75410743505.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/85700273752.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/vutoxupagoweda.pdfIn PDF document text
    • http://17njl.com/userfiles/files/wuxaserutixosofe.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/detipa.pdfIn PDF document text
    • https://cmoretv.com/userfiles/55223743902.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/bufumigazazizuxinorarabe.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383cf3c325f---28563240484.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/kabeb.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109100121225141.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/92344358551.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/19863119507.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=streaming+gratisoe+tvPDF 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_off0000bebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEBF 17168 bytes
SHA-256: 642c3367508ef4b3b7cd124d5cc8ea935f130593cab7c272664dc2dd17e1dc6e
font_01_sfnt_off0000eb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB15 10548 bytes
SHA-256: 929990da5afdc12a32fb9bf160441aa83d06a3e50bb639836cea97ce7e45126b
font_02_sfnt_off00010325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10325 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.