Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0e1e794108435e2…

MALICIOUS

PDF

73.9 KB Created: 2021-09-20 12:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 23fb18aa44d67c75fe9d08e3c0967ea2 SHA-1: 0614d50c2c6b47913b5310f9c6982e9d6113db2f SHA-256: e0e1e794108435e2087f49bc2207ace43f42848a80ba164be901fbda13a235d6
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains, indicating a link farm designed to obscure the true destination. The ML classifier strongly suggests malicious intent, likely to deliver a second-stage payload or phish for credentials. The presence of embedded JavaScript further supports the possibility of malicious code execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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://ciaooo.ru/uploades/userfiles/file/66816898332.pdf In PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/65821667807.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/88609981022.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/dumopoxivedajotaxaputo.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0666785001631361533.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/bemuvakizuxoz.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/jepezesamogexikeselod.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/fukubajusu.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/lanarenubafobusaxigus.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/56359930073.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/kuwuferirigapaxabasunumuv.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/xosepatodapovojikemajar.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/6562109617.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/wenukomexibafu.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613669704bc75---mibojomewofodo.pdfIn PDF document text
    • http://klhl.com/userfiles/file/71818790945.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/30921601612.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/nuxekorapu.pdfIn PDF document text
    • http://guowangcable.com/d/files/gobokakoganenegor.pdfIn PDF document text
    • http://sushibelovo.ru/files/29076201543.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/67325664351.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/46170142513.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/zawukotamiduwewotibodomaz.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210910_040623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=grand+theft+auto+online+downloadPDF 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_off0000c145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC145 10508 bytes
SHA-256: 4baceaf4eabba324c1ef808f28683a93b97a5a51d3b27ddf7e545de6a6a600a8
font_01_sfnt_off0000d91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91D 15888 bytes
SHA-256: 397f4d0bb7b3be38953cb80884ca79610ab56b1f3687155bf0dd42f67a6d0ea2
font_02_sfnt_off000101bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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