Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd917de4ddf77eff…

MALICIOUS

PDF

85.2 KB Created: 2021-09-19 00:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: db8005fd79f5243c9343c1472aa47d47 SHA-1: ea2dcfec511431ced20e78b7ba3e5df439a6085e SHA-256: dd917de4ddf77effb8e6dde71e248e6f9a68c5bca9189db13c19a42dcdf68f1d
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are characteristic of phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://coretry.ru/uplcv?utm_term=how+to+remove+browsing+history+from+android+phone PDF link annotation
    • https://keluargamimpi2.com/contents/files/3710425272.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/86015015917.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/15130897357.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/nifokuxenumurevoveneja.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/xutotiwin.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/4188331791.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/fojenavuxesabojijuvog.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/54645268482.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/58926119358.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/fufulasevedus.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/24489396543.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/u8ku45ph3c2cs1udjmoj6hgil6/92268087103.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/jotexoru.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/73084407260.pdfIn PDF document text
    • http://oris-am.com/editor_up/63660428386.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/mepojifa.pdfIn PDF document text
    • http://wingtsunkungfu.ro/imagini_ws/vurozeta.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/41496408069.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/8859158790.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/mowuzusimix.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/tiketaziguku.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/73512349269.pdfIn PDF document text
    • 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_off0000e676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE676 17620 bytes
SHA-256: 1cb58e743ebc0854b4d284bfaa31ddb4c4f6c2925e2d4cdc8c675d0401a7eccd
font_01_sfnt_off0001148f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA6 11296 bytes
SHA-256: d2406a0ef7e94b1382ea69f13d2546ad364c5177858362167c2e741e1c18dac2

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