Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3e2f8cf7f21771…

MALICIOUS

PDF

84.7 KB Created: 2021-09-20 15:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 662e54762289a2e1474f33d482310e25 SHA-1: c210d710081f0bc23f1f96fbe108c046ded89a2f SHA-256: 8d3e2f8cf7f217711c0c1e0864e211aff25dd0d81ab9bc2084303f0b8b0a1697
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to unknown or potentially malicious domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a large number of links, suggesting a phishing or spam campaign. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/wejabo.pdf In PDF document text
    • http://francescasciortino.it/userfiles/files/48135704449.pdfIn PDF document text
    • http://hak-al.com/resimler/files/17477516129.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/vuxuvimabaguvafelonok.pdfIn PDF document text
    • https://alpinashop.bg/files/2319844405.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/zuneja.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/10821501699.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/dekimoxadolebumefolil.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/lalimiguxerenolim.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/wudupodifeveraxaded.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/fevulanobuxud.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/jubotovojopupuzasuwa.pdfIn PDF document text
    • https://denimder.org/resimler/files/25079644433.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161471ef68a3aa---61713184889.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/sasexunifitabuke.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/sosatinodegetunetojepo.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109131020115483.pdfIn PDF document text
    • http://idroter.org/userfiles/files/81717798798.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/4102466501.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/rigikufofitap.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/mizogevoporizifo.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/62404006140.pdfIn PDF document text
    • https://beaszemin.com/files/19846983537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=a+man+called+ove+pdfPDF 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_off0000e31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2E 19480 bytes
SHA-256: 235492e987e6b5c74193a345d02ed2d309eb5d27cad24b1f3c173a20ffd14b20
font_02_sfnt_off00012df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF1 10372 bytes
SHA-256: b68eb0ece2f3333018017912bd504cd2010b3d8595a691fb4415daa7a2a00403

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