Malicious PDF — malware analysis report

Static analysis result for SHA-256 76144754a58274e6…

MALICIOUS

PDF

79.7 KB Created: 2021-09-11 05:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c12811466e75eb23b1700866d5989822 SHA-1: 6d3d9aa4d0e106213984377468e010c09e883b9d SHA-256: 76144754a58274e68b5237456157afe76b183376d44e24d29441964645373871
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://catamma.ru/uplcv?utm_term=how+to+hide+photos+on+redmi+note+9+pro PDF link annotation
    • https://oolong-dining-co.com/webroot/editor-uploads/files/52262609378.pdfIn PDF document text
    • http://c-six.it/userfiles/files/48097869390.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/giladigexavigakixeda.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/39915856547.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/bofelisebumojajup.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/kukila.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/13337565740.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/30418367504.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/lodoxodu.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/25522555669.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/36311274944.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/74131556065.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613414c7d1674---18920212656.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/34363796497.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/24328468675.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/gomexige.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/mafuridotema.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/9639799114.pdfIn PDF document text
    • http://thevale.us/userimages/2120289888.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bea1c95854---95897894351.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/sitetelonawixuti.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_off0000d476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD476 17296 bytes
SHA-256: 8e5c7c9d4aa180ea57ac4d8f67b57ddf09761c72ac8a84f7adc991e39930aa59
font_01_sfnt_off000100db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F2 10696 bytes
SHA-256: 2a04041d21942ec4d64483cf1ad5bafffb974728d4c6c6d719be2c63a086581d

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