Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5dc2a02997752c4…

MALICIOUS

PDF

79.6 KB Created: 2021-09-17 10:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 21c7d4f07b835f1a5b1455b148b6ba10 SHA-1: bfd477a0e52650ab6cdaf9516d7a80716acae1d5 SHA-256: a5dc2a02997752c4874b25d63268dc8358ee966a67676dcc3b9ad8ad3763f377
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which point to other PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the PDF is part of a link farm on disposable hosting, suggesting a malicious intent to manipulate search engine results or distribute malware. No scripts were extracted from this sample, but the presence of many external links and the ML classifier's high confidence score support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://www.propper-droppers.nl/files/file/zovag.pdf In PDF document text
    • http://hainescentreasia.com/images/file/divapavuxoxemilaz.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/24240395065.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/zipomemer.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/47157777902.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/nozepifunuxime.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1614420f45b846---41506944781.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/23494270873.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/bitazekopi.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/88220515021.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/56252270868.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/pomedifajogisufoj.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/3822509491.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/89577502599.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/90610807476.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/67177088437.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/benatamoxovojutujades.pdfIn PDF document text
    • http://eko-uklid.com/files/file/miwitazun.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/94761687231.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210916001645_jur4m9.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/fomapuluvegekoxow.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/34889013477.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/bopufirar.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/52607218435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=stream+triple+9PDF 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_off0000d46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46F 10264 bytes
SHA-256: aa58a6d94ef5552e30a8233ca6f7f7b96580d14d631dfe8ab5d43fd9db74d885
font_01_sfnt_off0000eb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB87 17724 bytes
SHA-256: de120ba53110de581e5775aaf33d9caeea34715287043ac64c563e52c50a4e0c
font_02_sfnt_off0001190d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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