Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4fe1fe5546fdd4d…

MALICIOUS

PDF

70.3 KB Created: 2021-09-26 05:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8dabce8445ab6721ad2f61517a0fefb2 SHA-1: 980f347ac6ab7fcf2cf7909aacca7cc2aaf6912e SHA-256: a4fe1fe5546fdd4d4aa0a442a89cd22f0f2ca7b239f4236b17e62639d4414bae
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=chromecast+on+computer+monitor
    • https://lodoshosting.com/calisma2/files/uploads/novunulibojana.pdf
    • http://ibshop.gr/uploads/_uploads/files/87537076202.pdf
    • http://sayarbobinaj.com/file/lewazanati.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/71c8a9580e65053bc0928e600425ce08/tuxemalenebol.pdf
    • http://albarossa.jp/js/upload/files/36459020044.pdf
    • http://myflora888.com/ck_files/files/43406273555.pdf
    • https://dycmc.com/DATA/upload/files/202109250726081623.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/winuse.pdf
    • http://www.schule.havonix.com/ckfinder/userfiles/files/9814219672.pdf
    • http://shsuorui.com/uploadfiles/fckeditor/20210904/file/16307251313717.pdf
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/97026140941.pdf
    • http://studiospazioambiente.it/userfiles/files/lunisamulabawopupa.pdf
    • https://ibextrail.com/editor-images/mufur.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebec0da373---dewowedodusogoviv.pdf
    • http://cissi.it/userfiles/files/vakem.pdf
    • https://coolinterier.sk/upload/files/33405997433.pdf
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/bovexusez.pdf
    • https://safetypadlocks.eu/eurostyl/photos/file/juzalemisexale.pdf
    • http://alarcon-v.com/editor_upload_image/file/tuwumemek.pdf
    • https://chameleoncoupons.com/adgprocessing/uploads/files/1148318487.pdf
    • https://blogsma.com/files/92996142541.pdf
    • https://teamcode.net/upload/files/44504794897.pdf
    • http://sdv.sk/userfiles/articles/file/bixirikosawulifa.pdf
    • http://www.77ice.com/upload/files/47956286659.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_off0000af36.bin
d1b83d49c45d3966c9478abdb2b139192bf2ee6f37b45eb2633d262f65bc119e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF36 10724 bytes
font_01_sfnt_off0000c7b2.bin
22569b730f9a77bab1eb280064b87bd10f6dfc5e48a3e187cb2c4d09156382e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B2 17236 bytes
font_02_sfnt_off0000f3ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CE 16792 bytes

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