Malicious PDF — malware analysis report

Static analysis result for SHA-256 a50855aa7b0beb1e…

MALICIOUS

PDF

72.4 KB Created: 2021-09-09 08:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 32543c0d430be3ad4ba3a8ca51acf249 SHA-1: 8f776973f519c1cf33e7941da77a4638a37eb9aa SHA-256: a50855aa7b0beb1e9abe15313fa6fd8be20be68090fdd99e884f6f226b2e95ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to malicious sites.

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://philabc.ru/uplcv?utm_term=android+tablet+as+picture+frame PDF link annotation
    • https://condicionamentofisico.com/arquivos/file/94426082671.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/34013290658.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/xifobavivuxibabebebakem.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210906180502.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/nuvalemexiruja.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/69613329152.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/93877513202.pdfIn PDF document text
    • http://sapaelitehotel.com/webroot/img/files/83108095409.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81489615273.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30850504292.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/5829710977.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/mipaxerubadopi.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/nizasaladu.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/tenazalewelonib.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/vabedibokimedeg.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/46949252731.pdfIn PDF document text
    • http://szcftz.com/upload/57596970009.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16135ceee34378---banawavozifudazidigot.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/dejejupejejotavapeniw.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210908_8940D0FEFE2CD7C6.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f8e07ff53---sufugodunu.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/vexemo.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/bibasunizewupuxisevawunu.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_off0000b789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB789 11000 bytes
SHA-256: 1103106db37a159676c83fb2364ae6d55a960ca1c0065083a517edeb4918b9c8
font_01_sfnt_off0000d0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F3 16544 bytes
SHA-256: fbeb48fc375220a510f8609a96ac856f9f650095733cc6b9c30c92e9c1ea8d83

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