Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d274a9a7aecf92…

MALICIOUS

PDF

84.3 KB Created: 2021-09-08 15:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2218baaecf17e9002c56ac3f536bd88f SHA-1: 9f6d3a0df2ece6b5c5c19f835217b6b2cd763fd5 SHA-256: e7d274a9a7aecf925d73e0c35a854b4a1c98c782bef49fb8c784dd06eac1c2dd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, one of which, 'http://maremio.ru/admin/ckfinder/userfiles/files/ragaguvagegatanebarefo.pdf', is flagged as unknown reputation and is likely a malicious redirect. The PDF's structure and the presence of embedded links suggest it's designed to trick users into visiting a compromised or malicious website, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://maremio.ru/admin/ckfinder/userfiles/files/ragaguvagegatanebarefo.pdf In PDF document text
    • http://ducthanggroup.com/webroot/img/files/wewujotumonadotomijizida.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/3827918337.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/72217909933.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/piworexede.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/88813925298.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/38575452690.pdfIn PDF document text
    • https://gianlucabruno.it/dati/upload/file/gidusot.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/xinati.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e2524c087---bejeduderozisewowefe.pdfIn PDF document text
    • http://ikcem.org/userfiles/file///dukagafalanasig.pdfIn PDF document text
    • https://reniuved.it/file/kusijejamonitonotixonaru.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/1ijbra4qhti4jngm4vqf3r7hn7/93509081549.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/gamogidapelitanolel.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/62908370306.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/wajemovulisijetaximonav.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/fotisolaxuzi.pdfIn PDF document text
    • http://tiquital.com/documentos/file/63364998814.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/gugiziwusalasumarobodo.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-8/20210908025008522331.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/xikatiwodelikemilugebu.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/52376626058.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=consumer+behavior+psychology+marketing+pdfPDF 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_off0000df79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF79 11612 bytes
SHA-256: 539a41488a05a8c6d2edf04a021d334f3472290a31e12cbecdcf176fe3fff74d
font_01_sfnt_off0000fa87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA87 19344 bytes
SHA-256: 6fd13c906c14dcbb1ba6662ed818276725ea147fa34a279758a90af1455be183
font_02_sfnt_off00012bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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