Malicious PDF — malware analysis report

Static analysis result for SHA-256 16fcdc59dce88679…

MALICIOUS

PDF

80.0 KB Created: 2021-09-20 06:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e6d8356a6d84215d4ffc6c6392a6c065 SHA-1: e4cdd4ab1ef358ac2c824899ea7d67be5195ed13 SHA-256: 16fcdc59dce886791e5d85601ec6b4da163db7fafc4a9307010240de174b5392
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially malicious or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/76527226360.pdf In PDF document text
    • https://nutrishop.in/ci/userfiles/files/tegubokipugajezekam.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/kenid.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/9866687680.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/14692246025.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/80144741635.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/peneronumujewibuvizafezuw.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/kilisizu.pdfIn PDF document text
    • https://tempegaring.com/contents/files/gonidaja.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/tagabopetugoluwe.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/bajefevugolazomejuzinib.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/mitejabosogusituwuxe.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef80034cb6---63249175964.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/zewifibasurasejomawisi.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/202193123056048.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/retoxezudili.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/55345570448.pdfIn PDF document text
    • https://equinox-e.com/upload/files/kozab.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/17956486240.pdfIn PDF document text
    • http://18554080.com/userfiles/file/posabikitosevuvusife.pdfIn PDF document text
    • http://tapestry.cz/images/file/files/15479316596.pdfIn PDF document text
    • http://bastola.org/userfiles/file/fijoxarusisamifobezopu.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/64859187148.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/kimudosabiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+check+memory+leaks+in+androidPDF 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_off0000d49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49B 10916 bytes
SHA-256: e154e1d586ebc05b9ef4c286cc3ca63f1cab51285150a9e31a81e6883c4b9e44
font_01_sfnt_off0000edbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D1 17168 bytes
SHA-256: 9991eacecf2ddaa059a91b8d8417c9e4c3051d6e55283bb2cf06a101133144b4