Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a577ca1885a1d12…

MALICIOUS

PDF

84.2 KB Created: 2021-09-15 18:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e8160c2f5b4313aa8c597a8634019d00 SHA-1: c2d50d7136359f849a1596fa7b345f14999e0754 SHA-256: 0a577ca1885a1d12da913af813e9561fb3fc0209b856a4b30de87238f3034228
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. ClamAV detection and ML classification confirm its malicious nature, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://wirtrauenuns.ch/images/file/wawuxezafoledamij.pdf In PDF document text
    • https://gea99.com/ckfinder/userfiles/files/66844681197.pdfIn PDF document text
    • http://fjsxsx558.com/upload/files/kijinuse.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/retabodaxa.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/jevusera.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/95891338896.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614181a76597a---telixi.pdfIn PDF document text
    • http://eternoohydro.com/d/files/49957893485.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/kugetunigowetixogetokepa.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/navovuxibegogodonirumadag.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/14244810739.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/vuwami.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/69723084318.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161376ae4b08f4---voloxozes.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/5412618557.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/86286966190.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/17301099369.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/54544878513.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210904_155121.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/jopadal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=dragon+ball+super+climax+mugen+apk+downloadPDF 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_off0000de19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE19 11280 bytes
SHA-256: a8f9b5e27f01fd5ab9938b1cc8c617511d5fbaeab33bed6012a54d1ebfb48f79
font_01_sfnt_off0000f823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF823 19176 bytes
SHA-256: d2a29f54f7ac446a0196fc14791d1753788e12b2c67ba503f30fc1906b95a135
font_02_sfnt_off00012b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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