Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc41c6f8b87e5f6…

MALICIOUS

PDF

88.5 KB Created: 2021-09-23 00:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e6b34fe7ee4f9260a392533c8e369fff SHA-1: 625c464bdc06227c4d2d8162ee78308a038d825c SHA-256: 9bc41c6f8b87e5f65bc3e6b74154d947fad08b0f81fa3bc3fe32ec67036afa03
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of using disposable hosting for these links. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://myphamhelios.vn/luutru/files/xigizolupumex.pdf In PDF document text
    • http://s2ipower.com/survey/userfiles/files/molupizujagam.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/24664584432.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/nopasuked.pdfIn PDF document text
    • https://sentralperdana.com/file/xijadexegen.pdfIn PDF document text
    • https://pbpkrosno.com/fckfile/wumaxunobupeferuz.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/26360898381.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/lifurag.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/pumawajogefin.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/82631352228.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/bilonekirabenodomaselo.pdfIn PDF document text
    • https://artenika.pl/fck/file/4793923414.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/wadej.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/28104657127.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/79219371473.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/folibesudikulu.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/d772a889f91be20fc30b07a5cdb34661/20047801378.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/zoturenirupo.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/bexatejezatuza.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/jaxelozurexadegunoruse.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/guduriletato.pdfIn PDF document text
    • https://www.confirmedtour.com/files/zenepexatubevude.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/gopedulita.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/93563495548.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=android+version+10+updatePDF 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_off0000f4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D11 17948 bytes
SHA-256: b8893271f8c8e60b2ce2bc697a38fcd1fdd0e77493453f62bbd9659cc17b787a
font_02_sfnt_off00013b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B8A 10660 bytes
SHA-256: 56c31bd3fcf8a74838f5624b6b2dee353ae30a7ad203b787188e38dde14bc245

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