Malicious PDF — malware analysis report

Static analysis result for SHA-256 6259218f6d6c3e38…

MALICIOUS

PDF

84.4 KB Created: 2021-09-19 22:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 00d20be9bc96b5c89e8d2b11cc6d3f79 SHA-1: 1f9ca6787ca9a26ec46165bacca804f77d95b121 SHA-256: 6259218f6d6c3e38e73313d6bb3edfb5a18a9a0fff49cbb1d4b5cab93ab30542
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://makassitools.com/userfiles/file///84524003821.pdf In PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/81749022376.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/29034747873.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/43515889931.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/57002650980.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/tojavedikonazemalikitipa.pdfIn PDF document text
    • http://airmon.hu/images/files/tewinujewisapeguwef.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/xinadetunowijavesabida.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/50565435989.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/53590416906.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/74916793581.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/47526401121.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/livozejukanavawunirefazef.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/pebofaza.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210910224447.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/9398645472.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/25621252081.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161431e795ce89---9739994617.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/96751232120.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/24321297070.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/rizipixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=the+sound+of+music+stream+freePDF 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_off0000e4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF4 17940 bytes
SHA-256: ca544a32dc78c621d8bb3173f13cfa9abdda3778b383fffb320b9eebadb24d75
font_02_sfnt_off00012b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B86 10756 bytes
SHA-256: c937e7512161b4725ef99ab43a5e282e78ab59079fdaa6428d86b60242bb56ac

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