Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee7504e249087f9b…

MALICIOUS

PDF

79.0 KB Created: 2021-09-20 21:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a0831c5ff855ad02b19562cf4f79b35c SHA-1: f28464fa5ecfbcd74cc7e2151448f917c0b9387c SHA-256: ee7504e249087f9b8e05ae9285c8197c7906d165614e3d9e425521cd2f7db4e5
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. It also features numerous external URIs, including one pointing to a URL that appears to be a redirector, suggesting an attempt to lead the user to a malicious site. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6141

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://krisoc.ru/uplcv?utm_term=free+fire+ki+video+banane+wala+app PDF link annotation
    • http://jumpstart.mobi/ckfinder/userfiles/files/19733256081.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/u5r1s9905utsbntr73tg43k0g1/kutibimagevixomomarebu.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/46744459421.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/12272065216.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210916035344_1122507453.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/6776302702.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/megefafotawuzo.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/87321523949.pdfIn PDF document text
    • https://servauto.fr/img/user/file/28559002120.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/powuterafukerikadipiwaz.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/xeneropurigenef.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/78429335927.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/vaxetavavoredaroxadi.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/72916802799.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/64141823175.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/53072599552.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/87965758734.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/70491801952.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/bewejunewutunukimaf.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/ruwajetajiba.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/kemabedo.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/dorabomigi.pdfIn PDF document text
    • https://maria-galland.ru/files/file/fulonagufolisuguvigetaxix.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/butojusevoxijiximelojun.pdfIn 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_off0000dc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC11 17860 bytes
SHA-256: c5a6fb6072f0c1dea4c23cb9c32a8dbc957d831de5edbb82663adf75f990c3ef
font_01_sfnt_off00010a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A88 10584 bytes
SHA-256: 5e8b1a14f7cd4932fd56a7a3d4a51e178ade899c15005344ca89942d86bfd5f0
font_02_sfnt_off0001228f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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