Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fd576b75eefbdb0…

MALICIOUS

PDF

71.1 KB Created: 2021-10-01 05:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6f126d235f9dc3a52b49470c6a9d35a5 SHA-1: 8cb7eced23d4f71edebb2618bbdd3596818b492f SHA-256: 3fd576b75eefbdb0073a4224a59a9b61720795d187264d82d4f9b75a117ac8cf
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for delivering malicious content or redirecting users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded JavaScript likely attempts to download and execute a second-stage payload or redirect the user to a malicious URL, as suggested by the numerous unknown reputation URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/7e9682d85eddf6453e3ad04acc77af94/43219171654.pdf In PDF document text
    • https://clubesolbra.com/uploads/files/zevejujemam.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/41111781391.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/43620237476.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/1187121140.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/tonuligitojazejit.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/wakirimesajiwukifulez.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/pasoritokilanutakasuno.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/folagutepupisenisawo.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/7960174401.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/30977190994.pdfIn PDF document text
    • http://lejuriste.ru/files/file/gewupuvejokowazole.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/sireluxivoguvivo.pdfIn PDF document text
    • http://stylekd.ru/files/95174300991.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/godimulemilurujidapifaso.pdfIn PDF document text
    • http://potlista.com/file/files/simorabonopajepit.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/26493788451.pdfIn PDF document text
    • http://change4best.ru/upload/file/lajesolu.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/lozibuxomupetakarulotaka.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/58159557775.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/xikerup.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/38423626166.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/55445472430.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615267d07a868---26250509455.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/30844551533.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=garmin+connect+pour+tablette+androidPDF 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_off0000b114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB114 16788 bytes
SHA-256: 9ef5fd656c2de2d0031c46a897fc55a5575b8b4501e50095a97b4213fb7064a8
font_01_sfnt_off0000dc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC13 10784 bytes
SHA-256: afe434497f50b550eb3dd78001f54e723f3a686eedbe15c0ec7b23b2fd210cb3
font_02_sfnt_off0000f4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1