Malicious PDF — malware analysis report

Static analysis result for SHA-256 9335c4253b83ac31…

MALICIOUS

PDF

74.9 KB Created: 2021-09-29 09:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b92ea730ea75c4d89a0353e250092fde SHA-1: ca03c91091fc808866ad8c60719b99e73d886d51 SHA-256: 9335c4253b83ac317dc830b0c4f10c75a3f53d1a308da6a8e2a8dd6a7b9fd548
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 ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs, many pointing to disposable domains and forming a link farm, suggests a phishing or redirection scheme designed to lead users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://kleiberit.ru/files/file/vumixagawadulusatiz.pdf In PDF document text
    • http://sithome.com/upfiles/file/20210927002401.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210916130408.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///92609802667.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/wobagatexapanofo.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/tuwonira.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/sikadojovobup.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/66684410926.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210919_150323.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/motovadamulasugegix.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/78820895033.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/bekuxorazixelav.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/potobapinezetexajotupepuk.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/dizabupifulilawow.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/49692229749.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/f59735d9a834f1f6c06c997a7ef5c080/mufivotoligadudutubapiziz.pdfIn PDF document text
    • http://kgmda.com/upload/files/wafuwivibesuziju.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/sekinezajagofawowize.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614f996e36d72---53128202836.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lefitafipub.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/82074577806.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/99975010595.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/tetulurime.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/6899894285.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/narozerutobafixikusopuwag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=samsung+note+10+lite+model+codePDF 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_off0000bbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD409 18568 bytes
SHA-256: 8b4bd648588583607c457b2aafc5f188503f932b40b96f4720042621a39966d8
font_02_sfnt_off0001042b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042B 10964 bytes
SHA-256: 3e602a5b5bebe1f2acd6617a52f6b83b35e1b3116debcc1133ffafbf93150fe9