Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d44cd4aba9f848e…

MALICIOUS

PDF

71.3 KB Created: 2021-09-18 10:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3e9b10890632e6430c1a3ed965f9aefb SHA-1: 45fe13c223831bc7bdfdbea2d39a55ae4198ff0f SHA-256: 5d44cd4aba9f848e36bc80057742d67a105f1475be9329e08198c3b1fb626558
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document is designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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.
  • 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://archism.ru/uplcv?utm_term=aro+instagram+apk+download PDF link annotation
    • http://eyela.kr/uploadfile/fckeditor/file/99824635384.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109060449312262.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/88572278201.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/likizilegepumivuviw.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/wajamatekikoxowefegebexum.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/tufamexopuvoluti.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/venagutizozi.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/25576637367.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/3927320010.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/28742450142.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e5813ae74---73224579923.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/kowazugokevizonewaxodup.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/25300562617.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/26501664446.pdfIn PDF document text
    • https://korankertas.com/contents/files/68106607023.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/83119395516.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/wirakukog.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/99091681047.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b1ecddb4b---nanesolupanaxipesogunalow.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/63135017960.pdfIn PDF document text
    • https://zzhqhi.com/d/files/84600288485.pdfIn PDF document text
    • http://dentherapia.hu/files/file/19667150169.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/65789965775.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/60075281986.pdfIn PDF document text
    • https://soechi.id/userfiles/file/liwizogujufiwu.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_off0000b965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB965 15136 bytes
SHA-256: e0bea7c6c561623ef02ef10d6a9e82edee06a39d487c6ea80e62ee32a97d401c
font_01_sfnt_off0000df4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4E 10760 bytes
SHA-256: 3c3361ef9fc80aac2f3e724249522169598a0b64679ebf187cdd949bb38e1010
font_02_sfnt_off0000f7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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