Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d93e3bb5b00269b…

MALICIOUS

PDF

85.0 KB Created: 2021-09-22 14:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a9119a2d2ff00d7fd05056e62a1a95c7 SHA-1: 62aeb64ef0d306d704bbec07847c89711d95e9d8 SHA-256: 2d93e3bb5b00269ba0781410aa9ec0bd633f526dbb2cda3987f2c97feaa6f9cf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery, by directing users to external sites. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://infrive.ru/uplcv?utm_term=i+have+forgotten+my+phone+password+what+should+i+do
    • https://kar360.com/resimler/files/45047422810.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b750826880---kulujerekopavazoxazi.pdf
    • https://inmaabiladi.com/userfiles/files/37202861583.pdf
    • https://rsvforum.com/userfiles/file/79810647222.pdf
    • http://suliaox.com/v15/Upload/file/2021912459556743.pdf
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/pakusum.pdf
    • http://detaycopymatbaa.com/userfiles/file/mamunolofikajux.pdf
    • http://magicfood-cn.com/files/20210919120735.pdf
    • https://octvads.site/js/ckfinder/userfiles/files/55076062829.pdf
    • http://studio-rivetti.it/userfiles/files/tinikenasi.pdf
    • https://mimpishio2bet.com/contents/files/tiwozofenafab.pdf
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/runukave.pdf
    • https://nexapos.com/upload/files/16114577868.pdf
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210907_2331070A95DB7FD7.pdf
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/tavopebirukobamu.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/d1e742244d07cd9e4a47e1ae01bea7f5/81968522130.pdf
    • http://conelser.hu/fck_uploads/file/xikenuke.pdf
    • http://sissonne.hu/editor_up/6073688843.pdf
    • https://blueparadise.pl/userfiles/file/24987134613.pdf
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/nibefizitimufirinujumezi.pdf
    • http://s292376414.onlinehome.fr/datas/imgmail/file/31292501438.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_off0000e3ff.bin
23d876f3621630b73de48cb79592a3af0cba9ad02afc47aa91d6e9a31663aba3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FF 11264 bytes
font_01_sfnt_off0000fe13.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE13 16792 bytes
font_02_sfnt_off00011625.bin
03b7fcb36c22683123775b1dd22e45066da76032e7271f31f04566a3bc3e0fdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11625 18440 bytes

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