Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a701c56b5fbe40…

MALICIOUS

PDF

82.2 KB Created: 2021-09-19 03:37:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c87ead9261a04b6e225e0e987a4e9614 SHA-1: 35dc6926bc87e45852481e0232c155ba9203fc76 SHA-256: 21a701c56b5fbe404d0f9198aaf1e10a63c683ac2b0ec989a7f32b4bfc8b8be3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via the linked content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://vibrobreaker.com/files/files/22450206025.pdf In PDF document text
    • http://sunwisechem.com/Uploadfiles/files/wazilikotowovezovuwebe.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/48291862397.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614148c24dad8---kurazukatogogirusit.pdfIn PDF document text
    • http://atsolution.org/userfiles/file/20210912063339542446899.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/6563305404.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/bufenirupokumas.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/fanoxudijigokaditalavota.pdfIn PDF document text
    • http://www.ntweac.edu.hk/admin/ckfinder/userfiles/files/sivatuxosexizafitixefobi.pdfIn PDF document text
    • https://kawanmto.org/contents/files/pamobupetidonaxiwogoxujo.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/53179824791.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/kuxowaraguzupexi.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/tukukekezonoremimedune.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/50574862584.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/63267802228.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/77274517445.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/fewevowupifuripudejuvujib.pdfIn PDF document text
    • http://vswet.ru/f/79373014357.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/53856121123.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecaad534cf---45532242344.pdfIn PDF document text
    • http://centromp.it/userfiles/files/81838708577.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/rokowuf.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/moxavonorutodasa.pdfIn PDF document text
    • http://analhospital.net/file/files/79824242424.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=the+outsiders+full+text+pdfPDF 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_off0000dd4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF563 10496 bytes
SHA-256: e5942d62a59a431c31c696373a1a14bbfd5bdf9db7099ad9ab9941e0bcc88e9d
font_02_sfnt_off00010d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D63 17780 bytes
SHA-256: 56a4329727104a1140b5a9f44317558e85e0b6670fdb1ee947307bc9b4cea6bd