Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b17ec58c0eb02ec…

MALICIOUS

PDF

80.3 KB Created: 2021-09-23 10:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f15e9b126f95a5f9e80556c7566e6ef7 SHA-1: db34569c6fcfc5ff68f75a9ef3bee04ecc9a8755 SHA-256: 3b17ec58c0eb02ecd45eb4d98ff4ec307202f95468a63efc9d3bc92a991bad8b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm or phishing campaign. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent. The ClamAV detection as 'Pdf.Phishing.Trojan' further solidifies this assessment, pointing towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=watch+leap+year+2010 PDF link annotation
    • http://gzafjc.com/uploadfile/files/57022964105.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/64409666449.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/pobubewi.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/25057324417.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/97387117111.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/91691828298.pdfIn PDF document text
    • http://texmet.pl/userimages/file/xokesaladobupewasi.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/pepagibilim.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/ximemijozozubu.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/wurakopebin.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/sozujosowetogez.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/9e00c5bfd9cf8a182e28479982041ee2/55516154700.pdfIn PDF document text
    • http://mobitransjogja.com/files/56708792677.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/82743662575.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/pojulibuxewuxowegovibuxu.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/lutezujetafilugofuk.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/d82de22791a6ecd522e8de1c48e75e77/lodojokaz.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/94976098914.pdfIn PDF document text
    • https://domilot.com/uploader/files/xowit.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/kulijinulaxefaruper.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/79050609075.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24778494697.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_off0000d351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD351 18080 bytes
SHA-256: 6c675ea1936da458353ce47c1bf3dfd9e7db70d41a994871cef43c398808597b
font_01_sfnt_off00010204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10204 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1B 10388 bytes
SHA-256: 4f281e30120bae4faa21b505c09cec305ac47b08dff5abed1760ed2794f503f3

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