Malicious PDF — malware analysis report

Static analysis result for SHA-256 383f3e5ceb3ab18f…

MALICIOUS

PDF

76.8 KB Created: 2021-09-16 07:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d1da6418b83d9ed0cddc4b4d03975687 SHA-1: c514da710ae660e50561ab2b9c18ca9065890a79 SHA-256: 383f3e5ceb3ab18fbee4f5198d72ae921b219e67fa921323983642a231e6c5d5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs, many pointing to PDF files on disposable hosting, strongly suggests a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://archism.ru/uplcv?utm_term=how+to+combine+2+videos+on+android PDF link annotation
    • http://bettaletroom.com/file_media/file_image/file/teperipalobobujuvu.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/vijazujegurupanefoj.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/vowamukaz.pdfIn PDF document text
    • http://podarox.ru/public/files/soxokima.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/39917658254.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/22220618847.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/jadup.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/rijupafogiwofewizutalita.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/7362769641.pdfIn PDF document text
    • http://3m18.com/images/editor/files/77265607906.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/94620376846.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/semusix.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/14046309225.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/6820491210.pdfIn PDF document text
    • http://briztravel.com/upload/files/dujos.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/kopipukiwadeb.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/ohe3cvj7r0hshacnbhuf7smqn2/16563043898.pdfIn PDF document text
    • https://akvaguru.hu/user/file/girojix.pdfIn PDF document text
    • http://climtech.com/files/files/pevokow.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/34509637892.pdfIn PDF document text
    • http://offerparts.com/upload/files/60618325773.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/ralop.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/72715892385.pdfIn PDF document text
    • 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_off0000c8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E1 16836 bytes
SHA-256: b2e3c60e43d5e29a9371facdea3b29ae1d7cd51fdb3cc0c68398ec84ab4de935
font_01_sfnt_off0000f3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C13 10888 bytes
SHA-256: 23cc12a447326d836b5e975ae1273ec5d6f1103f412b94787aa5bdc1491a108f

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