Malicious PDF — malware analysis report

Static analysis result for SHA-256 bffaa9d17553c909…

MALICIOUS

PDF

81.6 KB Created: 2021-09-09 06:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a70f37e80e09abb58fea60eec168426 SHA-1: 54a9e55987d479b05a5707fd19c1db78cc6f9dae SHA-256: bffaa9d17553c909018ab898c6974f994ef7c0d6d0ee93d80dcb266ae6b8d341
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 presence of numerous external URIs, many pointing to potentially disposable domains, suggests a phishing or malware distribution campaign. ClamAV and ML classifiers also flagged this PDF as malicious, reinforcing the assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://novo-foto.ru/ckfinder/userfiles/files/midujarazipukabuserotisev.pdf
    • http://talesma.com/E/file/bowalakotema.pdf
    • http://drsuthichai.com/userfiles/files/roworonugim.pdf
    • http://vangphutai.com/images/uploads/files/74307532692.pdf
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/viwolugufuzisogosuki.pdf
    • http://gianenricofabro.com/userfiles/files/betareretulosobigivuvupi.pdf
    • https://giga-tronics.com/userfiles/files/81039891388.pdf
    • http://z-i-f.ru/userfiles/file/18579681659.pdf
    • http://finalstage.biz/js/upload/files/jopakatogakufow.pdf
    • http://chono.mn/uploads/userfiles/files/zofetagumavinulit.pdf
    • http://3bbb.fr/ckeditor/upload/files/12082867557.pdf
    • http://innotack.com/userfiles/files/71811350928.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/0lktsvr2nubqkb7prq0cqbg9aq/46438804321.pdf
    • http://lapawan15.com/shop/fck_file/file/menuvunexijelugu.pdf
    • http://luckysim.com/userfiles/file/betotuw.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16135e43fe4228---migukuvumuta.pdf
    • https://tectrongim.com/uploads/files/norux.pdf
    • http://sapaelitehotel.com/webroot/img/files/5260760055.pdf
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/tujowaju.pdf
    • https://happycondo.leaddeehub.com/userfiles/files/64445120434.pdf
    • https://penzion-palice.cz/content/belidiwiwukulufof.pdf
    • http://brno-skoleni.cz/ckfinder/userfiles/files/sosonif.pdf
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/rinufavavoliluvipovariti.pdf
    • http://hhoasis.org/app/webroot/img/fck/file/vomoveneku.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=mod+apk+of+candy+crush+saga
    • 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_off0000d974.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD974 16792 bytes
font_01_sfnt_off0000f18b.bin
40d2ebced545b02fa8aae086a8348250f4d3fae06846ad32806e54fafc9c57fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF18B 10828 bytes
font_02_sfnt_off00010a47.bin
f1284b41bd118110ec8a788975575f4a70d4cd5d8519ce5e7169934c7814bc6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A47 17928 bytes

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