Malicious PDF — malware analysis report

Static analysis result for SHA-256 13ab3976b60f40ac…

MALICIOUS

PDF

75.9 KB Created: 2021-09-13 21:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3d60b826fd540908aaebddf160415d67 SHA-1: 50eeca1b9630e5fb82e3141203ae7dff5e9e17da SHA-256: 13ab3976b60f40ac5afea6cf48352cfeba1d73078f69471b5dd86d2f815a8ceb
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of external links, many pointing to potentially disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://chelseacarpet.com/ckfinder/userfiles/uploads/59766271809.pdf In PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/belivekivaxabuwubir.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/nipexavivorexezuwazuzuv.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/kubawagasanogomilixebo.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/motozejasokuz.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/64865073069.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/duxiloxadozonanabuvelapek.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/jupakuta.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/nurepumufirugivu.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/gixaw.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/kisumenorufulibajo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137cab95973c---48086976255.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/simugodovipub.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/kusuvamotejivipekifabiro.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/88375165238.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/43631603632.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210908182358179.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/72697479090.pdfIn PDF document text
    • https://negaratoto.com/contents/files/salemalirakemo.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16130403c017e9---40965210311.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/dibiwakajeli.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/rutuv.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/75087607320.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=solar+smash+free+to+playPDF 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_off0000c523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC523 17520 bytes
SHA-256: a4d1175f888317c788ff7d59454d48abf43bdbab8f604c42273e9717a3d89b44
font_01_sfnt_off0000f210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF210 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A27 10616 bytes
SHA-256: 7c9eb6067d69ba540ba4d82dc65d8e34aa0bb657b9b255fe9802927297b0dff2