Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3a03b0aa213035…

MALICIOUS

PDF

83.2 KB Created: 2021-09-17 11:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: da3756f253ac797fbc1618256b2f6072 SHA-1: 1d816d3e634cf72ec7e1541153f15bce81277439 SHA-256: 5b3a03b0aa213035ceb52aeb9f0d45a263b4be08d787007306c0cb1d1211d226
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded JavaScript (T1059.007) suggests it may be used to redirect the user or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://domoticasociale.it/immaginiNewsletter/file/68074988761.pdf In PDF document text
    • http://campfirewtx.org/userfiles/file/73816607247.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210912215142172614370.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/59179786726.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/51014966316.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/76290182390.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/lisunir.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/57211514303.pdfIn PDF document text
    • http://www.siposferenc.hu/html/purulomoribubebobewoniba.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141023da87c4---27086267459.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/10222533551.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae49010669---20442609962.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/vawanolut.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/jubarivifonovuvubi.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/34545666556.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/jukumi.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/gerenomi.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/safamoj.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/20353789140.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/92234042841.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/mudikupomifolududakopi.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/44086024832.pdfIn PDF document text
    • https://tekartltd.com/upload/files/tajukubir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=life+as+we+know+it+stream+freePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EC 17576 bytes
SHA-256: 31ea9d95ad55e0717e6b73f1f8b2b286cc47e67a386e1af3ef20a73066c50008
font_01_sfnt_off00010f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B3 10464 bytes
SHA-256: 4f7f2b3c6ebba83d2735c261e5eefee24b9ad6413ced4b4fddce0f4d0cf84145