Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc4509f87f0b4d32…

MALICIOUS

PDF

72.5 KB Created: 2021-09-12 01:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b182e3f1326c7459b449e9a40964cc39 SHA-1: 3a455a93ff9cffb7660595d6d2244bd91fe9f85d SHA-256: dc4509f87f0b4d327771d534b82d04c6fca78347b04d55f481d8567906fa118a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a high ML classifier score indicate malicious intent. The document also features a large number of external URIs, many pointing to PDFs hosted on various domains, suggesting a link farm or redirection mechanism. This pattern is commonly associated with phishing campaigns or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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 https://smartstone.ca/userfiles/files/letikel.pdf In PDF document text
    • https://netron.pt/app/webroot/media/files/74177050338.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/riwekidudipural.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/46654070094.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/zosufe.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/kfdis8ht82oe3jddijp030eng5/pizovezelemadorobuxosisub.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/dizajafojitaxakeli.pdfIn PDF document text
    • https://zhansq.cn/upload/file/depexiwugal.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/dolasofixefanolu.pdfIn PDF document text
    • http://zatacorp.com/upload/files/vuzowe.pdfIn PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/vagefogudetevufunixuxovaz.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/jukow.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/zobetojinak.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/36209280503.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/19186743934.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/labolitebimowiru.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021912_45254_793.pdfIn PDF document text
    • https://aayams.com/userfiles/file/virutiginajeragigabaz.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/doselub.pdfIn PDF document text
    • https://quizai.com/uploads/files/dexamoxutuziwopuvizijigun.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/pogulidovivawemuvekuw.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/vevodisubitav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=thea+stilton+and+the+spanish+dance+mission+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_off0000b850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB850 16756 bytes
SHA-256: 0bb0d99d5e36c8c968851ba83db210ca039f99da4e1d61eaa385ef8594ecd89e
font_01_sfnt_off0000e3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A7 10748 bytes
SHA-256: 1122bfd2250df86553ef03652318cf6d1f336cb2537a5549134762d967362437
font_02_sfnt_off0000fc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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