Malicious PDF — malware analysis report

Static analysis result for SHA-256 5152f39c96772966…

MALICIOUS

PDF

80.0 KB Created: 2021-09-09 19:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: f6ef7c02957817dddc6e1ddec6b5ce05 SHA-1: 4c4fd5eef2546fc8ba1a6a2b17b4f89a9cf724b9 SHA-256: 5152f39c96772966db3b81989f59057edbfed07d50fdf74e3ab0ed671efc8a83
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 0.9960

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://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d44d449a6---77746231234.pdf In PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/pilomawesexuxoxep.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210906133119_699061.pdfIn PDF document text
    • https://tpk-m.ru/files/file/benidifusavalopogixud.pdfIn PDF document text
    • http://parentini.it/userfiles/files/35968680030.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/21649579088.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/linufategoso.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/wezewasepososimarelozegof.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/xapokesufum.pdfIn PDF document text
    • http://cartopack.be/Images/file/denovanawej.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/lafozunibiregatikiliz.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613729d425823---vavuvavis.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/51628320084.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/5308205307.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/2120513214.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/91141099307.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/43763788159.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/54066562313.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/44924789468.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/xeruxewatigikesugumipuk.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/jexujovugadibalakobinomu.pdfIn PDF document text
    • https://dafelia.com/files/romodopavume.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/diwenijurobagirepofojojoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=gta+san+andreas+download+hackPDF 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_off0000d487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD487 17544 bytes
SHA-256: fe47952ac0f8bc0f0d9fda63bfd7507bbba4b8729d53d49a1d1a00f533c8d5f9
font_01_sfnt_off0001024e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024E 10592 bytes
SHA-256: e48530ae146220d401c94ac820583d1438e3b224ea5700e2b073983ae4859708
font_02_sfnt_off00011a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1