Malicious PDF — malware analysis report

Static analysis result for SHA-256 f829ef1c48def807…

MALICIOUS

PDF

76.2 KB Created: 2021-09-13 02:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 17caf7a43be79085a8dbaf583ab2328f SHA-1: 480026d6a29fe95db8bc6a1dd4b82ee412ade2aa SHA-256: f829ef1c48def807c70c43f7f22063ecf6af49c44eeb86ecbff1e28ca42b53f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the sheer volume of unknown-reputation URLs strongly suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a lure to download additional malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pixomot.ru/uplcv?utm_term=sao+season+3+episode+1+english+dub PDF link annotation
    • http://mtegl.wsystem.sk/userfiles/files/kelojeberenig.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/52598561639.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/84466834578.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/dagelebawoz.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/11915505781.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/zegejir.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/17685745776.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/27616492652.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/13140015180.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/wuliwobake.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/gumipatebuzifopulijow.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/mubanirudapipowijapegid.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/22350051123.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/95184693134.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/vapemilejuvagosin.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/5124464100.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/20721405727.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/61418949096.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/vigunofapukanewadiwin.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/b4a76ca56470bf477143cf383f56cf0f/32934633596.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/97040788823.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/foxerik.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/3158600305.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_off0000c460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC460 11012 bytes
SHA-256: df858f2114e85fb7462758f542bc67e2799b372f5c62fc153cb2ebc0ca4c861b
font_01_sfnt_off0000dd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58C 16900 bytes
SHA-256: 410f620df32c69c4b9351eb3ee3ae5b6f34eac49022cf1f7c642c3a9e179f430

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