Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4946ed25c9b5d6b…

MALICIOUS

PDF

71.4 KB Created: 2021-09-26 07:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a234b22c493da650730fb568947fffca SHA-1: d33ed9bfa768a952600f85d9c6fb5dd28e9247ae SHA-256: e4946ed25c9b5d6bb0820edf97b8571a6234b687d2767ed90618f8e40318b0f5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of external links hosted on disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://seamacros.com/upload/file/61183607752.pdf In PDF document text
    • http://rjbmachinery.com/d/files/41697910450.pdfIn PDF document text
    • http://smirna.pl/files/file/fesukef.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/jafedajali.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/kubimeba.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/9995369934.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/66006324235.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/52916288054.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/36472939909.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/98449986666.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/72557333021.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/96918986049.pdfIn PDF document text
    • https://pmms-online.com/assets/file/34197479912.pdfIn PDF document text
    • http://topflexsports.com/uploads/vatuwesogoxepomazopeti.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/neterametisoled.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/21439467486.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/fibabiruzazofogajir.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/56597614883.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/80099150613.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/pedimeji.pdfIn PDF document text
    • http://ibb-online.ru/f/file/93415369804.pdfIn PDF document text
    • http://hopkim.vn/upload/files/94215808866.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161455b33c5d82---tunolotoruwere.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/raxokeregesedaza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=plus+messenger+old+versionPDF 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_off0000b1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BE 17784 bytes
SHA-256: 2f0d068e203e24a4966898a86ddc87cf0df3ba471554b14d5fcb6bee361d901c
font_01_sfnt_off0000de6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF682 10496 bytes
SHA-256: 98d367a1d9cdef539e6657a6cc70eefdc72ad8a1d019d0450bb80e71330c9dd1

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