Malicious PDF — malware analysis report

Static analysis result for SHA-256 75b4ab8e569c8637…

MALICIOUS

PDF

84.8 KB Created: 2021-09-11 19:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ca75d949835efdc94f4bef467abe7ae0 SHA-1: 141df2a0bf917c5dfdc0d9f5343c6cbd9c623f72 SHA-256: 75b4ab8e569c86378a3ba18c76ef7f068de5588aa7b93336632c852867c18835
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 disposable domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high likelihood of this document being used to distribute malicious content or phish for credentials. The embedded JavaScript, though not fully analyzed due to obfuscation, likely contributes to the malicious functionality by interacting with these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://thaoduocvn.com/userfiles/image/file/fupilovigilifanerabebud.pdf In PDF document text
    • http://royalgroup.at/tmp/41455065322.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210908_5437CFC3C8214B2D.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b24a8825d7---wolegojatadasufusiw.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/85976358410.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/33855516749.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/87790720349.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/24958084613.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/ganedojov.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/39140931424.pdfIn PDF document text
    • http://artospace.com/pics/file/firalepapeb.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/87237654480.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/57105753280.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/tufimazu.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210904224707.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/14783061299.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/gukuwo.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/82075073096.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/9391444705.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/72256553810.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109010601186592.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612efcbeb8b64---binuxuzebodukowamaw.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/20577898862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=botw+sound+effects+downloadPDF 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_off0000e65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65D 18224 bytes
SHA-256: 98024bfba25b47a822e0368607f9f310fd2af97c2858f76d81b70a54a3870a43
font_01_sfnt_off000115dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DC 10516 bytes
SHA-256: 85e1eef32b911d773899b15f7c5386705ff8c4e3d009c76d8da98b80ad95dcf7
font_02_sfnt_off00012e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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