Malicious PDF — malware analysis report

Static analysis result for SHA-256 278568f392635240…

MALICIOUS

PDF

74.4 KB Created: 2021-09-11 15:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f45d356012370e404a43157c2d3798b4 SHA-1: 55dae313bb55e416c3c90a74000d6d2f891461da SHA-256: 278568f3926352400b961f2b29ddc9a34640f790b57b10b39da85ad2920407fb
126 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to various domains, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for a large number of links, further supporting the malicious intent. No scripts were extracted, but the primary attack vector appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://inwebjor.ru/uplcv?utm_term=used+phones+for+sale+in+karachi PDF link annotation
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161362ae0cc8ba---88002545596.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/fuzipovubarigomovosose.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/volivataxenebarigudaka.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/52987964782.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/44655591097.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/91141099307.pdfIn PDF document text
    • http://cyuansheng.com/userfiles/file/jabemogek.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/kuxadosozad.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ae11ce2d5---firekuralerit.pdfIn PDF document text
    • http://classtool.info/upload/files/45710157309.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/97379286802.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/86451395678.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/28373026547.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/dixavabunorojodoporizoxil.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/36939966897.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/20066947584.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/63184057745.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/13660323180.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/70594880406.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/29727165055.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/fotijez.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_off0000beb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB4 17424 bytes
SHA-256: fc2ac8daeaaa4b80ca6188bf262de783d22288d0d9840a750a92a731d63cdbe4
font_01_sfnt_off0000eb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10363 10716 bytes
SHA-256: a7be312985b6b144d1e16936c3dfbbb49fd0f83ac4909f100cce413c003ca424

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