Malicious PDF — malware analysis report

Static analysis result for SHA-256 47594a7e501ac520…

MALICIOUS

PDF

83.3 KB Created: 2021-09-13 20:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5bd0cb3d543a69a619d3fa85da65b8b8 SHA-1: e4498a239c7039bc3e00d37bfe7908e6b59f72d0 SHA-256: 47594a7e501ac52024bac81964cdb84edc250bb470df92968a67219ca640e3ca
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links pointing to disposable hosting, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://garglob.ru/uplcv?utm_term=free+robux+working+2020 PDF link annotation
    • http://tonghuichem.com/upload/files/19639305415.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/54193179666.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/wepatisemozofeso.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/76750746535.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///rudazas.pdfIn PDF document text
    • https://cargobull.cz/res/file/fopipivuzuzege.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/tirewogopiweje.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/gemokesikum.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/1803ffa02f2c326333497ed47cd0ab3a/jikexekipo.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/jadujupaw.pdfIn PDF document text
    • https://etadelloro.it/images/file/doxomipabojopekuk.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109061248488735.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/mezosimijinukosawedutapo.pdfIn PDF document text
    • http://ruresept.ru/files/file/44978234347.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/49900475800.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/vuvulosiwerizex.pdfIn PDF document text
    • https://e-room.co/userfiles/file/67892431651.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/54200508111.pdfIn PDF document text
    • https://gangnampools.com/contents/files/jekidamipeboni.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c29dd88e11---62737516521.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/88497714805.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_off0000df68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF68 10548 bytes
SHA-256: 93a432e35f05c98d9ada83aeafb472847152f3885d9f6f22ec4089938ba45cac
font_01_sfnt_off0000f798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF798 18612 bytes
SHA-256: 7c3d20099397eba7bfcfba368f8092d0596e0a58583c2c64bd5b54d71fd967fa
font_02_sfnt_off00012811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12811 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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