Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dc6908eda109b4d…

MALICIOUS

PDF

83.2 KB Created: 2021-09-12 15:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5d0887f92519a972e7d5584b0359df3b SHA-1: d968959f76094103c90d37d06252e7a76ec97918 SHA-256: 0dc6908eda109b4d223cfb842ae47a228a710c4fe8e98df19862769d1e6a39b5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to numerous external PDF files. The presence of multiple embedded URLs, many hosted on unknown domains, strongly suggests a phishing or malware distribution campaign. No scripts were extracted, but the overall structure and heuristic firings point to a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://midel.me/userfiles/file/lawifebaliresetu.pdf In PDF document text
    • http://kgmda.com/upload/files/puzusemamurur.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/kabilijitatagarav.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161356f2ba23c9---27703973096.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/46687579034.pdfIn PDF document text
    • http://www.grifin.sk/files/jovoxiwiwiledazex.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/nujazefug.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/61030424597.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/143749941361321c5a22887.pdfIn PDF document text
    • http://reylab.com/userfiles/file/renuk.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/81917276353.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/99585192932.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/figosekolepuwa.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/torat.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/14076144002.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/572495c46ac350608b17de9ca7787e6e/93539549791.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/9060843453.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/nirinuwujolobon.pdfIn PDF document text
    • http://baove247.org/upload/files/51878220798.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/34012575023.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/movukek.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/67465084429.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/paruvix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=emperor+battle+for+dune+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_off0000e51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD35 10712 bytes
SHA-256: 06305a1520849cfcfe895d96fdb994aa803b414391193f422a22053f5901d510
font_02_sfnt_off0001156f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156F 16392 bytes
SHA-256: 612d5e7f759acde2bca020bd02bc423dcb0ef88ebe3551166a1f5ca332951a2b

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