Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b273b8323ce1a6a…

MALICIOUS

PDF

73.0 KB Created: 2021-09-11 07:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 93201d324c123c3ed030724bc0d635ad SHA-1: 6d090c5c9da3ff76e756ab6761aa6dca38ab449d SHA-256: 9b273b8323ce1a6a8eecf0795dd5acdf7de37b42f61b348431bbf9889e7f2529
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one pointing to a link farm on 'gaudi.tw' which hosts other PDFs, suggesting a distribution or phishing campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://gaudi.tw/upload/file/rebaxagavodoxalulug.pdf
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/20039509907.pdf
    • http://skncn.com/u/files/xatomo.pdf
    • http://kiuanai.com/userfiles/file/53981114109.pdf
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/26342030168.pdf
    • https://rmp-traueranzeigen.de/cms/files/48609826422.pdf
    • http://bertrandetgastineaudesigners.fr/userfiles/file/suditeges.pdf
    • https://havilahbuilders.com/userfiles/file/lililozikulizaxos.pdf
    • https://www.seblocation.com/ckfinder/userfiles/files/nusav.pdf
    • http://novichiha.ru/pic/file/50502002687.pdf
    • http://serdceprirody.ru/userfiles/file/lanumamulap.pdf
    • https://pfhotel.gr/ckfinder/userfiles/files/fuvozilegedutu.pdf
    • http://ephtour.com/FileData/ckfinder/files/20210911_C9D0437B019E3539.pdf
    • http://asacnfservices.com/ckfinder/userfiles/files/xojibitaku.pdf
    • http://nguyenxuanhuong.com/upload/files/93675164420.pdf
    • https://paintingwithapassion.com/nbloom/fckuploads/file/76657722240.pdf
    • http://22vek-omsk.ru/fck_editor_files/files/26936535138.pdf
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/nuzogojifivamuleb.pdf
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/83925036141.pdf
    • http://studiogalata.it/userfiles/files/dabefimulijaz.pdf
    • https://rosanaalvarracin.com/userfiles/file/luwazugi.pdf
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/satarosubutukafowo.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d36a97aab---vapetuzitozipekosex.pdf
    • http://analhospital.net/file/files/zisujefabitewuvaxip.pdf
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42172247991.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=game+pc+offline+windows+7
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba54.bin
c816b7381d385d64906106f8b6f82b2842e8afba756b7956aa1a1bbd807084e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA54 16788 bytes
font_01_sfnt_off0000e5f3.bin
0279dd45bdc5e136c94737cbda1599ceac4e21f7f739ff718dd0a9c2039c321d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F3 10756 bytes
font_02_sfnt_off0000fec7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC7 16792 bytes

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