Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a2ead97d827c41c…

MALICIOUS

PDF

75.7 KB Created: 2021-09-21 23:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d791814425804bba8ccf028f4c97c9c SHA-1: ebf652b650b5488950ac068d392f874ddb4c8b7f SHA-256: 1a2ead97d827c41c5f45b0050d2bf037d3cb8c8838c4890ce0f402c2da92be3f
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. Additionally, it features a large number of external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://nuraski.pl/wsg/userfiles/43706994392.pdf
    • https://odontologosmalca.com/images/userfiles/file/77418431964.pdf
    • https://www.iimranchi.ac.in/ckfinder/uploads/userfiles/files/92773298535.pdf
    • https://takarasushimn.com/userfiles/files/navekijekuzotifizovis.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614468c224c80---93220794862.pdf
    • https://gyvatukai.manovonia.lt/images/files/nuludexanesibox.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613923493434a---faworotabolapuxozi.pdf
    • http://ac-kenigsberg.ru/files/file/fatizupi.pdf
    • http://yaan121.com/uploads/files/202109070423554878.pdf
    • http://thebookmarkcafe.com/uploads/files/93741420211.pdf
    • https://seedomoretravel.com/files/files/lunesusozofiwajuperux.pdf
    • http://pc580.cn/upload_fck/file/2021-9-20/20210920113044816674.pdf
    • http://kfnmsz.com/upfolder/e/files/20210908015709.pdf
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/libilalonuzu.pdf
    • http://ispartaorganizasyon.com/ckfinder/upload/files/lajirak.pdf
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40424827375.pdf
    • http://kiemdinhcan.com/Images_upload/files/fotadadegadosorabodus.pdf
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/wigakofopi.pdf
    • http://unibox.lv/files/text/42526501628.pdf
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/98345006672.pdf
    • http://s-privod.ru/userfiles/file/rinewomikini.pdf
    • http://gzperson.com/uploadfile/files/gagikotojibexufibozo.pdf
    • http://studiomilano.eu/userfiles/files/35133668018.pdf
    • http://hotelniagararimini.eu/userfiles/files/5705297548.pdf
    • http://westfallassociates.com/documents/file/lugupizovijafenawos.pdf
    • http://goforthegreengolfpools.com/userfiles/file/78949832030.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=radius+of+atoms+in+periodic+table
    • 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_off0000c332.bin
793c6793d66ed9106e3a030659943e7b59b3e1a055f3cb01ae6af770f7d812e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC332 11064 bytes
font_01_sfnt_off0000dcb7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB7 16792 bytes
font_02_sfnt_off0000f4c9.bin
20700b97c4027d20ca04f618bffd8b35e48fb23ee69da93ec106b65b84b66882		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C9 17236 bytes

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