Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe951fe3a1ed14f2…

MALICIOUS

PDF

73.0 KB Created: 2021-09-13 23:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: efc4786efd87c2a65fd6a6851b09892d SHA-1: f0697b61389137ca263f7e62b9e9350cc92ff525 SHA-256: fe951fe3a1ed14f271f2fcacb8442c96af1115d45dd45feb4841ece4c9a3cd08
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://wonwon.taipei/photo/file/48251613033.pdf In PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/80793180094.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/roriwumuwireke.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/49405009231.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/62374170789.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/57523224313.pdfIn PDF document text
    • https://clove7.com/userfiles/file/30226605419.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/88983737342.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/81153159082.pdfIn PDF document text
    • http://373113.linker.tw/files/fofilule.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/lagivobonuzot.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/26652665908.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/50743450819.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/fibafeb.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/jiwumiva.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/kuwuxazikapoweneropax.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/piwuzidupareser.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/27818261036.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/e052c4cdbea17bdc4ba188477ad37733/10207054087.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/48745539561.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/lagobu.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/99107796490.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=bom+adelaide+radar+loopPDF 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_off0000bb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B0 10236 bytes
SHA-256: 361711db0bff216d6a5b00e3c7b1c02d886c3ebb7018e12d1aa4a4c5f7650cbd
font_02_sfnt_off0000ea93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA93 17120 bytes
SHA-256: 0d53fa9c98318af08958324246d5a0507960b3abf6dc79f664fe42cbce35d908

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