Malicious PDF — malware analysis report

Static analysis result for SHA-256 003a5d5fc32d738f…

MALICIOUS

PDF

77.3 KB Created: 2021-09-16 02:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4e94e691ad1c285e83a7b6a4fdb7f499 SHA-1: 69007a39c2def677ed4f29d84f90f2bdacfe0e15 SHA-256: 003a5d5fc32d738f16ee80d1ec2e8e73a52b3e999f25d3123293e7f72b58d62e
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to the document acting as a link farm, directing users to numerous distinct hosts. The embedded URLs, such as http://mclarenquartz.in/ci/userfiles/files/43082732381.pdf, are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://mclarenquartz.in/ci/userfiles/files/43082732381.pdf In PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/47561475663.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021916157443124.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/juvitokejetili.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/98210515503.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/76992368696.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/fasitulukagurebeluno.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/58153821313.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/sejixulel.pdfIn PDF document text
    • http://keyday.ru/files/files/wasusuloze.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/81057690039.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/58932897304.pdfIn PDF document text
    • https://limsurempat.com/contents/files/xurik.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/diwutudesigukefewotupetiw.pdfIn PDF document text
    • https://qnzar.com/files/mijumu.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/11131406223.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/449412cfc4a6f166c190942ef08f8b60/xogapovemilep.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/62454369251.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161427b4d2506e---fagavusakanujefez.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/89149362412.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/32738713521.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/wugagoduza.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210913/file/96648090432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=the+republic+pdf+platoPDF 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_off0000cb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB18 17520 bytes
SHA-256: 3f71407d11f2381d9580049738f98a4978e4c237e5eb3eaf8fab3577ac64a582
font_01_sfnt_off0000f75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F72 10648 bytes
SHA-256: d116203811e3e0bc692ff85e0d0ce50af7fbc02165de4d8b917541e8c631fe9a

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