Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e55fc4a71960fd8…

MALICIOUS

PDF

75.1 KB Created: 2021-09-17 11:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 934e4feabf9430c6698d4aa5cf8b9487 SHA-1: 0d40d84a3f2db07cfe437414fb59fdd374332a44 SHA-256: 2e55fc4a71960fd86f388e6f13ebc1c394d60e4341fa8a5615c45603d8fa348b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a phishing or link-farming scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites for further compromise. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://myphamasia.net/upload/files/fafewofoxadizup.pdf In PDF document text
    • https://contact-house.com/fckeditor/upload/file/71112665253.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/37843199778.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/14600635085.pdfIn PDF document text
    • http://atrsara.ir/resource/files/37371203238.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/wikitemiwajodusilezo.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/13740421970.pdfIn PDF document text
    • https://hssanesteban.cl/files/vodewebitewufotapovajule.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6be5ee31a---jamujamotaxovinezajomuriv.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/wutiguwosoremezatiw.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/90981476236.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/56063543675.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/40209177545.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/54294187403.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/fabebar.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/megem.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/sojufozilotarefulovetij.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-15/images/files/81027804835.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/lapare.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/32841879882.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142d091d4d7e---nipulufupanogarazorem.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/48987859986.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/33665010600.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/5717618037.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/68624058905.pdfIn PDF document text
    • https://e-room.co/userfiles/file/tugosubujamipipudexa.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/67886016454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=number+1+game+in+the+indiaPDF 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_off0000c331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC331 16628 bytes
SHA-256: eeb115a176616c31571fd983fd724428302b68151d57619511f3a21cd49121a4
font_01_sfnt_off0000ee46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001065d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065D 10632 bytes
SHA-256: 68b6e8ff52cb2a14a6d877b61633d72425225a5448ca76c0fd002fcb11140b5b