Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e1a1ee90d68aa02…

MALICIOUS

PDF

86.3 KB Created: 2021-09-28 02:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a55f17a6301747989c832cccf94a18b3 SHA-1: 732ab5fb1c10d444b37420b2143b191a9df5fa09 SHA-256: 3e1a1ee90d68aa02f95577e6e9706a6d5fa8d73b14fd2d10b7500c42468719c5
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated high maliciousness. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://geneolock.com/locktactyuma/userfiles/file/68681910077.pdf In PDF document text
    • https://100tmt.com/uploadimage/files/20210914095803.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/kotasofusada.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/16186676788.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/83649625685.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614929888fe99---texef.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/44725811789.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/55493186154.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/xopekajujexenedikezulab.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/jiwojizutepaxugu.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/tirerif.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/82273387782.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/86420623810.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/65036208420.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021092023174081.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/85761668118.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/sewojamusuxivutuv.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/lezerawumetilokupexomureg.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/19085516154.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/10558764681.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/49575744074.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/30695587103.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/meguta.pdfIn PDF document text
    • http://runwellconsulting.eu/file/file/37838904079.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/44300496626.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=l%C6%B0u+trang+web+tr%C3%AAn+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F4 23284 bytes
SHA-256: c699ff0e47078ce0d10be88eab7ccbd87d28b44e1463da7b03fc9324c45d1e33
font_01_sfnt_off000102eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B02 10828 bytes
SHA-256: 57cb2291938ddcfeabfc3f3ca36523e06fa9e033cbb022be41aa082aa9da1d4b
font_03_sfnt_off0001336e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336E 16188 bytes
SHA-256: 800554d3d6320da9c8ab21a3ad3d270f40e7a92360d7538c059d647d952d1d34