Malicious PDF — malware analysis report

Static analysis result for SHA-256 6905be928468f251…

MALICIOUS

PDF

99.2 KB Created: 2021-09-17 05:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5ebe815dc4e1d1592247e923810d4526 SHA-1: e9a06d307b299a081b9ad379b8aba11e06a6f602 SHA-256: 6905be928468f2518dd56d71ebede23cbeb5ea33cb02e5feee4e7b44f4694114
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code or redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to host numerous links on disposable domains, likely to obscure the true malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript likely serving to download or redirect to a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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 https://inprovitmexico.com/ckfinder/userfiles/files/72084990301.pdf In PDF document text
    • http://proxkimya.com/resimler/files/20775493845.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/gipitapobipakugoloz.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/68694865561.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/xavigotakojojevatal.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa8620632d---bofisufan.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/32417031507.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/doxulozekeguliwuzanesozup.pdfIn PDF document text
    • http://midospa.com/upload/files/telogokogur.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/45928806555.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/13355083504.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/nozesufowenubadupozo.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/9648016532.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/56898910353.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/62629596599.pdfIn PDF document text
    • http://vipdiler.ru/files/file/gejiritelasumuse.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/34289347356.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/zuxukimedebo.pdfIn PDF document text
    • https://mkontakt.com/dat/file/60110146095.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/nakutobinamixezejowo.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/lejezinetapilalew.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/gawizate.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/4467d33f1cd2be916bf376a35699174e/jiloraveguxumojekunimosu.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/dosobiwopeweta.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/79225961736.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/37040483147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=my+hero+academia+2020+moviePDF 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_off00011266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11266 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7D 10636 bytes
SHA-256: d81826b77ce4cb6c4c5a6e832990e6f886590c6dd9cd61b02e083483f91c71a9
font_02_sfnt_off000142e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E4 22708 bytes
SHA-256: 31348932a97031af3a35f571b27e462ce4372da42047c63accff85cf5f06bc2a