Malicious PDF — malware analysis report

Static analysis result for SHA-256 4468da29ac61b000…

MALICIOUS

PDF

79.8 KB Created: 2021-09-21 08:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ea3d4b3e05b22ad3a6a48a34753524e3 SHA-1: e35b179be9a71af24306b7efbbed5e34a91e6002 SHA-256: 4468da29ac61b000aee0cb27b7607003c3ec5d094fffa30264f4b2a7c45afb0b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with heuristics indicating embedded JavaScript and a link farm structure. The presence of embedded JavaScript (T1059.007) suggests the document is designed to execute malicious code. The numerous external URIs, many pointing to disposable domains, indicate a phishing or credential harvesting attempt, likely delivered as a Spearphishing Attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://nghieuphong.com/upload/files/12685566372.pdf In PDF document text
    • https://hankilfood.com/upfile/files/50906305452.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/bologonokajijuvo.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/fanozedosadurunaronesaw.pdfIn PDF document text
    • http://seto.cz/uploads/34649911216.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/papanodax.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/42340349209.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/13389423837.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/xizovexevamisaxamepela.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/rominu.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139d60573e3a---12662625876.pdfIn PDF document text
    • http://air-ned.com/uploads/files/zawopiretas.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/76748425833.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/zekavar.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f40cb5b39---52768435677.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/raxan.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/93528337222.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109181532406544.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/rujagevolu.pdfIn PDF document text
    • http://live-net.it/file/605691597.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/94307076532.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/wagumikebonu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=comment+bloquer+pub+application+androidPDF 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_off0000d077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD077 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88E 10924 bytes
SHA-256: 547b530ca79d1cd504e125b7f4a6b7311de0fdf88c5ce1f9e7f863f5549980a2
font_02_sfnt_off0001015c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015C 18500 bytes
SHA-256: 526df1213e1f1cb17cc75883f3d67155de02bf547ffad36e218d7b3f47d65578

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