Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bef90e3fd9c07e1…

MALICIOUS

PDF

69.7 KB Created: 2021-09-18 03:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e7d2a5e6543ce9a91ab1624e05b773fb SHA-1: 6cb4baa6f50042b2c165aaf7e6e35045f4f2052b SHA-256: 0bef90e3fd9c07e1f87eba4bbf3e1efd02a83a2b3d62885d5ca2bd1bdf3f4ec6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or are part of a link farm, indicating a likely attempt to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is designed to host many links on potentially untrusted domains. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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.
  • 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://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145289902a20---85609364756.pdf In PDF document text
    • http://aalzkj.love-mrt.com/upload/files/gaguzesus.pdfIn PDF document text
    • https://computerzone.pk/file/49224854631.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210914103758.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/rigazap.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/tozes.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614084c1410a3---kukubopubuda.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/54403572368.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/26340129520.pdfIn PDF document text
    • https://12shio2.com/contents/files/93845635732.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/duwunerez.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/6701685861.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/bivinukokufuxut.pdfIn PDF document text
    • https://sanidom.pl/img/file/73551444079.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/sixisetofififela.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/31594546121.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/ponazitat.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/12822688746.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/goworugowajijaporigabas.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/bovalutepiboridexuput.pdfIn PDF document text
    • http://wenxuezj.com/images/File/3046929049.pdfIn PDF document text
    • http://houselandia.ru/files/xutexegoranilosigebepas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=miracle+in+cell+no+7+torrentPDF 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_off0000b31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB34 10096 bytes
SHA-256: 01f2222417a4c22b104134aa9e19113dbcdf7149d59254a308a19eb240d0a074
font_02_sfnt_off0000e1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DB 15552 bytes
SHA-256: b629a7e3dbd4cf0c67c60b397a48858f42fc0e247c2ec3216bb21b275248795f

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