Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6e7809e00fe47a5…

MALICIOUS

PDF

87.1 KB Created: 2021-10-13 00:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 974349b496ec359803ec7eb677105903 SHA-1: 90cd06b12fbd3009de673740cd9ce65231c06583 SHA-256: d6e7809e00fe47a5d4c216ae48f2528bab19b097f63494dae675ae47a999b444
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates that the document is part of a link farm, likely intended to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bebaldebaran.eu/userfiles/files/xizelubuvuwu.pdf
    • https://aquaprosmart.com/userfiles/files/kivemodezube.pdf
    • https://tenfci.net/userfiles/file/puwojuvazeb.pdf
    • http://laughteronlineuniversity.com/images/upload/files/43944440420.pdf
    • http://vssteel1999.com/ckeditor/userfiles/files/bimajorakimaloxijovipoful.pdf
    • http://markasib.ru/ckfinder/userfiles/files/pisukisurizudugefije.pdf
    • http://www.verneteco.com/ckfinder/userfiles/files/92992978491.pdf
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/52243621479.pdf
    • https://cissud.com/uploads/ck_editor/files/93149228231.pdf
    • http://indago-rovigo.it/userfiles/files/9374854871.pdf
    • https://autosaloncenter.com/uploads/file/95383436087.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16160b6a1015d4---jitovos.pdf
    • http://buydecor.ru/uploads/files/10575490764.pdf
    • http://forma8.kz/ckfinder/userfiles/files/41568916423.pdf
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/47011704115.pdf
    • https://aahs.givingplan.net/sites/default/files/editor/file/30433653220.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/1a91b269nbalucdbof9gaj8nnv/36961248318.pdf
    • http://schokobrunnen.com/idata/85381662501.pdf
    • http://pk-rowery.pl/user_pict/file/guwadipisagazogava.pdf
    • http://pm-ural.com/uploads/files/movipewisut.pdf
    • https://questyme.com/userfiles/file/71173914625.pdf
    • http://criminisiepartners.it/userfiles/files/27536827676.pdf
    • http://marcelponjee.nl/ponjeefiles/file/fakanatowedirinenupokug.pdf
    • http://studioassociatoemc.com/userfiles/files/24548685380.pdf
    • https://feedproxy.google.com/~r/Gsjc/~3/4dZi1sgP-vI/uplcv?utm_term=reading+text+features
    • 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_off0000ee19.bin
2215988c37e103ea321cb80930c63fc5f284fb2ffb3796e20898faf6138984b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE19 10608 bytes
font_01_sfnt_off00010646.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10646 16792 bytes
font_02_sfnt_off00011e58.bin
df6a3dc4e57eaec605b3e4fd0b1e2c9daab29b70cb77ae4380b8cc1ee55d231c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E58 18416 bytes

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