Malicious PDF — malware analysis report

Static analysis result for SHA-256 162abf02e138e9e1…

MALICIOUS

PDF

83.7 KB Created: 2021-09-18 08:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5f3d8a62dfb3c29a4a00a84c838f525b SHA-1: 5a9be46406cb13ce4f93821d9f50eb1d7931caf2 SHA-256: 162abf02e138e9e126e17c2bc1f3fa64333a30fbaf3768975c0c8cb88343447a
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is part of a link farm, and multiple unknown URLs were extracted, suggesting a distribution or redirection mechanism. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • 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 http://bwlpsalisbury.com/uploads/files/3582426033.pdf In PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecfb0879c2---96500250581.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/wijokin.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/65996041833.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/kososejovisujuvew.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/bagebes.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28836865096.pdfIn PDF document text
    • https://mytopics.it/uploads/file/70539876777.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/2bb0f5df1939157be8d31bdeb3ad1c90/12395607690.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/tevuzow.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/firapanuvuzoro.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/72843046001.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/18603935563.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/geworanu.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/sakezux.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/30910921122.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/204037947.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/16558951500.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/58333219016.pdfIn PDF document text
    • http://hotechike.com/files/files/65100750753.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/65146580911.pdfIn PDF document text
    • http://dinhviht.com/images/newtech/files/tonofuruxigudu.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/79521123858.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/jiwuragawumivowagareku.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/lepavoxigulimipa.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/12005628029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=nexus+10+updatePDF 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_off0000e23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23C 18060 bytes
SHA-256: aee007fbd75adce94f7a14ca052ee91641ec4ebc09688500381721e8b723ce21
font_01_sfnt_off0001119f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B6 10276 bytes
SHA-256: 44c1a135b802523bee85e14e792bb994523407ef80f4061e6785116ea8228c75

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