Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a5d0635c481fb4f…

MALICIOUS

PDF

80.8 KB Created: 2021-09-09 14:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a60c22c1e5485449fae593653cb87268 SHA-1: 401533e8f80b7cec70529d8636bf8a7d05a6d4df SHA-256: 9a5d0635c481fb4f7d3f5bd9ef2835d2b1302ee41d8e3d5a070075c0d982d8f7
126 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on potentially disposable domains, suggesting a link farm or redirection mechanism. The presence of these links and the overall detection profile strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://wiskind.com/filespath/files/20210903160704.pdf In PDF document text
    • https://hinodecoder.com/userfiles/file/lariwitifaviboloror.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/vivexusawegus.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/85519800408.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/duleperuvug.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090611533478419.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/177fd665a9da7ad1223bbdb02dbc77ce.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/18589891288.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/62948169824.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/20687197613609bf0a4dc.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/zerexezotijilosalobeguje.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/29394495245.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/xafovanif.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/64960664528.pdfIn PDF document text
    • http://st03.it/userfiles/files/33367248002.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/97723158172.pdfIn PDF document text
    • http://www.andreapondika.cz/file/86530381958.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/7b4d073258ab9b40de408574fd932623/golaximuxov.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210907205709.pdfIn PDF document text
    • http://fabtur.ru/upload/files/62725705849.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=skylines+2020+streaming+vfPDF 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_off0000d2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEC 11024 bytes
SHA-256: 685220a3bb280761e5ebe4e7fea09fbb8a3ce30843819e49fc1fcf128ca463ac
font_02_sfnt_off000104ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AB 18908 bytes
SHA-256: adeabf28bfafb1c1c7f1431dae03df6ecbef7f51619bff6b990b3874d50e46d3

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