Malicious PDF — malware analysis report

Static analysis result for SHA-256 00bbdaa3eb19e245…

MALICIOUS

PDF

84.8 KB Created: 2021-09-19 00:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3dbb086fc78418f99d5e7707af7c6733 SHA-1: 461a3fad5dea284af90adc0006d7a4de652c715d SHA-256: 00bbdaa3eb19e245bd274086238605ea6a03f2585713a9cbd8b5cd9ad3629b9f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The embedded JavaScript is likely used to obfuscate the malicious links or perform further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://hong-tour.com/FileData/ckfinder/files/20210903_4FA5DD87ED2AD002.pdf In PDF document text
    • http://coumert.com/images/file/lomogamapefexajegip.pdfIn PDF document text
    • http://kahsport.cz/userfiles/file/galudipomalev.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/8352746620.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/62695026856.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/48769411435.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/72796384666.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/68326998996.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/sexipok.pdfIn PDF document text
    • https://merlak.ru/userfiles/file/7907693392.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210919051049_687sip.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/gavevigapuperi.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/salikitulaf.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/mazipoparan.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/xatitirubekulewusozaj.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11686422630.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/4716424978.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/lelaxa.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/sukunaloduwakutowif.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/38810971735.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/towalesuburokadegufon.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/76843504234.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6c125450e---malekobesulobadoneguv.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/debewojavutaweso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=age+of+empires+android+appPDF 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_off0000e6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF8 17760 bytes
SHA-256: 661d67c60f3e81f9f7573fa27f27a61e399749de4099db265882d1a5ce24b0ac
font_02_sfnt_off00012d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D30 10676 bytes
SHA-256: d13656768aaedb2114f468a296120af53de2d19d0b482d48c91a2109e0b024d3

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