Malicious PDF — malware analysis report

Static analysis result for SHA-256 26a7fe4e48ed5048…

MALICIOUS

PDF

72.0 KB Created: 2021-09-14 01:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 521aff9269ec99a1ba79116088be9e5c SHA-1: a28cb26b8f504f0cef7799479b75716293c6b2d7 SHA-256: 26a7fe4e48ed50485d7cfd63c8392dd635a6be24d125e73be5852c07ef479381
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to exploit users via social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://laulumaja.fi/ckfinder/userfiles/files/18053787083.pdf In PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/68445907489.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/972e4c4193526fedd5783bb4c2bce878/bajuzodiliwipunilusukofo.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/45353644234.pdfIn PDF document text
    • http://oodow.cn/upload/file/2109050155002133697s1ou1gj6ot5.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/83210262485.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/xezulipelebibugu.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/60621269023.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161341e92aeca6---6952224257.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/99074487993.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/sujunezizusosix.pdfIn PDF document text
    • https://slicktechproducts.com/newerac2c/userfiles/file/54288328548.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210913022411.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/91274060375.pdfIn PDF document text
    • https://webrobogo.hu/kepek/bezekituku.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/biwetilevijufifusabiteti.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/zipiradufazavibi.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/74456544143.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/61142049031.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/gubufejaziki.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/60944858040.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/66234126651.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/ximekunijutewetuxelefok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=techniques+and+principles+in+language+teaching+4th+editionPDF 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_off0000b4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CF 11080 bytes
SHA-256: 2a783e1a360f19bc422f395f5cf91de215ef6078a8a1fca837eda41e4ac87320
font_01_sfnt_off0000ce14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE14 16872 bytes
SHA-256: 40c891527a76974c0cd33c125fa5ef1989266317d271ec0397087501fad978d8
font_02_sfnt_off0000f9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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