Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d7989d4e711f5e…

MALICIOUS

PDF

76.2 KB Created: 2021-09-12 03:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5ba2df32d3122fc9aa8dedf9916e152b SHA-1: 8a193ebf0e892264f291bbdf9aee25b1622676dd SHA-256: 87d7989d4e711f5eee45f98f1cc922537830687972da5a3f944d995a7fb70615
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm on disposable hosting, with multiple links pointing to PDF files, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the overall structure point towards a phishing lure, likely attempting to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://mannaz.pl/userfiles1/file/wumapekevizezuminopi.pdf In PDF document text
    • https://amgaa.org/temp/files/15488377061.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/7404057965.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130947f5e90d---82931541790.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/43681786362.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161373b2562cd1---vuzenubebenitoruliladebik.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/82955261123.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/wozefejovowagonugupazili.pdfIn PDF document text
    • http://praguetransfer.com/files/file/bobozafilinukuligesoz.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/78629960632.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/soxobejemuvififizibet.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/zorusin.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/61155295145.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/91014670503039484b9f8ab827ab5d1c/67973236406.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/refosogekufagi.pdfIn PDF document text
    • http://www.moyekolodin.com/files/22129185730.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/togalogixixusuxajab.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/89929122645.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/rifipotukutuwoseza.pdfIn PDF document text
    • http://vipdiler.ru/files/file/fofigasawajudo.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/girefasixom.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/67686264954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=windows+10+pro+latest+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_off0000c2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FE 10740 bytes
SHA-256: 7d367c11d6302cdd74436ac05cb67568636d26acd9aaf079109d9411aa41b655
font_01_sfnt_off0000dbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD8 18316 bytes
SHA-256: cdd636e3dcfd539f353720c02da3d1eeba1fd8db1dee5211b702593b4a284ac4
font_02_sfnt_off00010b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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