Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf57d1fab991cca7…

MALICIOUS

PDF

84.7 KB Created: 2021-09-18 02:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9667fadc819de585a2537452b19ad903 SHA-1: 63efdeb99a16101aa866478468c2dbc4f256391d SHA-256: bf57d1fab991cca72389593e5844ee3a9f67f3d2bfcfc7dd9a9eb8ce38c6d836
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to various domains. The document body is heavily obfuscated, suggesting an attempt to hide its true purpose, which is likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://dbexpertise.fr/catalogue_dynamique/file/radajetejurakelexezuko.pdf In PDF document text
    • http://sattosushi.com/uploads/files/46751515912.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/joweb.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/xunid.pdfIn PDF document text
    • http://www.520amis.com/upload/files/26193921403.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/34230944462.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/regemelobutero.pdfIn PDF document text
    • http://samtle.net/ckupload/files/sefusirinafawo.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/e40132525e403bcc5fd3d07d23348e02/18503690679.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/6200030026.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/37906555608.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/kisubufajakokufu.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/72881814007.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/pexilewefulepixazu.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/dobumosopukema.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f69e68d1a---75067580706.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/23846567989.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/63370346380.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/22110687700.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/garolumetupi.pdfIn PDF document text
    • https://andhimazhai.com/images/files/zefod.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/bexowapujej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=best+ad+free+games+androidPDF 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_off0000e8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BE 17172 bytes
SHA-256: d32193c5515ec6fd877069d07f0080f7764ca9eda0a570e1746b4ab6d9d23861
font_01_sfnt_off00011515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11515 10704 bytes
SHA-256: 7a32a7df7cf7ce91f854e145d25d8c0cdc4f74d5a1ef22ad630d99308b947f7f
font_02_sfnt_off00012d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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