Malicious PDF — malware analysis report

Static analysis result for SHA-256 1600206156aff2eb…

MALICIOUS

PDF

87.3 KB Created: 2021-09-15 18:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2370e58ec2572e673a8b5ffab8e89eb7 SHA-1: cbf8ad0c8fdd1526b8cbe9944bf00477bc037405 SHA-256: 1600206156aff2ebd2cad69883824d5144fd4122a47b2ef15d57b682963065b8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to a link farm, as evidenced by the numerous external URIs pointing to various domains, some of which are associated with link farming heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ketchas.ru/uplcv?utm_term=example+of+cv+in+english+pdf PDF link annotation
    • http://zenobiacultura.it/userfiles/file///22396847940.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/4181172257.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/1737180316.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/feluzuxozupasapezi.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/zenosoponigetozezuwoze.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/jukatorinixilesitope.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/361775006131622ce0e58.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/sitavesagexixejunav.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/32243339894.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42627209182.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/joputizel.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/minazukunikuwul.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/ritumejukububumuvejanu.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/jeleliribifabes.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/bobisitomofute.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/77719602596.pdfIn PDF document text
    • http://samtekelektrik.com/files/45347590280.pdfIn PDF document text
    • http://thegioioto.store/upload/files/jepujaluvitepajejofu.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f259d759ae---1232884227.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/xewubol.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/wokerikefigeledujavet.pdfIn PDF document text
    • https://matrixx.lu/images/lokevigatitu.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_off0000eee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE3 18244 bytes
SHA-256: acae9872e2d7ba519be59f1cfb8509c3a5b601ef1261998414abcaa9c7982ae3
font_01_sfnt_off00011e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13665 11020 bytes
SHA-256: 5a9fe34c44c78b77e39b5544f2eb6a6940558174fb91b432f19186ffc2938774

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