Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1e57a7f5b86b51a…

MALICIOUS

PDF

84.2 KB Created: 2021-09-09 19:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 166a24122583040cc8957c409a69c96a SHA-1: 87bfa3e0b7d5af389dee90748bc83f7ad0997955 SHA-256: f1e57a7f5b86b51a52cfc4a02a231155909f0bbd5bddddba9ac976c73e5ae579
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are structured to appear as file downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to host a large number of links on disposable domains. ClamAV detection and ML classification further confirm its malicious nature, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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.
  • 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://chcial.ru/uplcv?utm_term=how+to+make+a+tiktok+video+a+live+wallpaper PDF link annotation
    • http://maremio.ru/admin/ckfinder/userfiles/files/ragaguvagegatanebarefo.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/99053607718.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/64209177893.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/99753386583.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/bfamu32ns845rgv2j6avefh51f/nidabonerusedivij.pdfIn PDF document text
    • https://adikkedua.com/contents/files/welipewubawabakofebi.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/27686452761.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/xugujejipobinumadegeme.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/muwawamolusorepabusemep.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/bepirenenan.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/sodajilafetagojemopujobi.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/38247637903.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/25538710203.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/89102325405.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/ludedu.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/5565621453.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/23516919750.pdfIn PDF document text
    • https://bak.vn/upload/files/pasodikonamika.pdfIn PDF document text
    • https://ksuskalology.com/images/file/zazujozuvir.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/65919768780.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/93332210832.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/wevikuwa.pdfIn PDF document text
    • 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_off0000e2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EE 10516 bytes
SHA-256: aeb4f1685b555c1f08dbddf3c63c96ee48acb57a739931f1444f2a7b9ea89bad
font_01_sfnt_off0000fada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EC 18540 bytes
SHA-256: 5fb10fc25f7c3a55b5093fcbc873bd0eede1fc0f87bb9db6b42009422532296f

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