Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c32a79548f6a21d…

MALICIOUS

PDF

85.9 KB Created: 2021-09-16 09:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b6a394e4197469a55e2143361d30c515 SHA-1: 2ae68d2274c1ace8f949f0b10c099151ac6d6b63 SHA-256: 6c32a79548f6a21d68812134a365a9fc496fec596071f022a7ee8197fc8ddfe3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://philabc.ru/uplcv?utm_term=is+it+possible+to+get+facetime+on+android
    • https://dcicz.org/userfiles/file/zisorutajalelelekevu.pdf
    • https://aldapa.eus/files/galeria/files/61256374720.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161320ce08f0b3---mofijazarelozobudulur.pdf
    • http://crestviewshopping.abwingsmd.com/uploads/files/62315181821.pdf
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/dawulupikatitoroxedixuxit.pdf
    • http://majortaylorride.info/images/uploaded/file/34164590366.pdf
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/72160496827.pdf
    • http://prasongp.com/file_media/file_image/file/72374643321.pdf
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/gopiwopusom.pdf
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/jizab.pdf
    • https://ferropula.hr/files/51536725538.pdf
    • http://bamor.org/userfiles/file/33325402549.pdf
    • http://vtaky.sk/media/file/gopur.pdf
    • https://devcons.org/uploads/userfiles/files/zokewuxezepa.pdf
    • http://111-orte.com/testarea/cwsCMSlight/media/files/wovilizopite.pdf
    • https://trexanh.net/upload/files/xazarug.pdf
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/31536327968.pdf
    • http://yesilderecine.com/admin/editor_resim/file/61460266071.pdf
    • https://www.autopsrus.com/ckfinder/userfiles/files/54051187178.pdf
    • http://www.sport-konyv.hu/userfiles/file/nemopepazuxusibadawodi.pdf
    • http://cesurmakina.com/userfiles/file/38224542462.pdf
    • http://stavo-bazar.cz/userfiles/file/tibapiruganorofezuz.pdf
    • http://julianowka.pl/ckfinder/userfiles/files/79582605602.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5b3.bin
88c9ac3b1d7c8d2c20750007b08d53fbe890c38508e02f5bbf6e4e1d4a79dd6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B3 11052 bytes
font_01_sfnt_off0000ff00.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF00 16792 bytes
font_02_sfnt_off00011712.bin
c0860b2d629fc428b03bc128f260e66009de41f84d779395db672d93012ac4d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11712 19452 bytes

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