Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c8404daf62492b…

MALICIOUS

PDF

76.8 KB Created: 2021-09-17 13:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b0cf22dedf2c6a2495e2501709af407b SHA-1: b00a766be9f59ed8c0a721e6a396b9402e521bc6 SHA-256: 71c8404daf62492b96c406ebd84f8c150248b4d6dc646e889e8329b038621d2d
126 Risk Score

Malware Insights

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

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, indicating a link farm designed to obscure the ultimate destination. The presence of external URIs and the link farm structure suggest an attempt to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://geologicatoscana.eu/userfiles/files/88499964210.pdf In PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/tmqt3bbvslr4lijdpelt23jcv5/sedoxibimuzi.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/fokubevibesulisoladesibol.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/16919076130.pdfIn PDF document text
    • http://wdnederland.nl/file/62404395447.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/24928216154.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/romudupurijese.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/niruku.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/45172868383.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/3278458708.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/99230650109.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/67878899261.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/24246115260.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/5831661783.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/769019169.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/45534644281.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/lovebujilinow.pdfIn PDF document text
    • https://intersat.lv/files/file/24440821030.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/14686485603.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/54753441896.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/25335116529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=paulo+coelho+malayalam+pdfPDF 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_off0000c29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC29E 10536 bytes
SHA-256: 7cd61914f52065fffef3b08b8a5d993bc1d6b09387a36e4dcfa2a7d20f4bc8fc
font_01_sfnt_off0000daa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA6 19628 bytes
SHA-256: a3f88ee6b21a9fa505604d6f2c56e983288389f2ce9b917b0d2510885f8ec5c3
font_02_sfnt_off00010da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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