Malicious PDF — malware analysis report

Static analysis result for SHA-256 33bf7ecb0c7b0720…

MALICIOUS

PDF

71.3 KB Created: 2021-09-08 15:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2bbdbbe1b1f2c9a37920b65c03578099 SHA-1: 0f6fc2c1ed8153e9fe2836103516f85f163da270 SHA-256: 33bf7ecb0c7b07203a6fdaa25f89943c70bcfcca4cde26555ac105d0868fae3d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are indicative of a link farm used to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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.
  • 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://cructi.ru/uplcv?utm_term=civilian+control+of+the+military+pdf PDF link annotation
    • http://bburago.info/admin/fckeditor/userfiles/file/jeremawonimenegapakenes.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/vulizodeworebiwav.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/bezemidagapigi.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/70621526931.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202196235438.pdfIn PDF document text
    • https://rintrans.com/files/60224829297.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/36587728143.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/tamikujewowi.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/rinimoxixorokuzilonori.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/81453807379.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/26108121190.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/sogapotosa.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161364302380be---46926112535.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/27575199007.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/vuwitak.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/ronuwuwevetiduturidove.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/57548813784.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/moserazobeta.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/buvonuximowepetetesilafit.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/70239933814.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161344d3a1cebe---51932955477.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/rigutafiw.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/47384367737.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/13190656531.pdfIn PDF document text
    • http://melvin.cz/data/muxaduzo.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_off0000b67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB67F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE91 15640 bytes
SHA-256: 4900c165b1400692390245b9e0a01e33cd45b2f2228686f552c6cd8dca6ae6db
font_02_sfnt_off0000f665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF665 10928 bytes
SHA-256: 1edb5b931caaf88e351afc51829bea62b1742a38b8adcd0717ca880fd9c0d831

Open this report in the interactive analyzer, or submit your own file for analysis.