Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5282633c03677ba…

MALICIOUS

PDF

75.4 KB Created: 2021-09-18 03:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 8a22c199b45d5f1c163ab22677ec639c SHA-1: 8093b42b3eac50c6605e86cddf8878a1147bdec1 SHA-256: b5282633c03677bacd4faac835e6e730b857a3c41aed3e20f50882dd57d9edd9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also hosts a large number of external links, many pointing to PDF files on various domains, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://corianderedmonton.com/ckfinder/userfiles/files/22703511295.pdf In PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132c8b0af9db---38360213782.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/munesinum.pdfIn PDF document text
    • https://thehouseproduction.net/file/11066685304.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/tevutigomasagulimojakut.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/76622812826.pdfIn PDF document text
    • http://napiarsaigh.com/images/80779870440.pdfIn PDF document text
    • http://climtech.com/files/files/suvudarimoxup.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/weziwosanume.pdfIn PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/23161551814.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/93391383204.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/4803321085.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0a7504b66---44956319027.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/tunifu.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/sirovasodupufolegavogu.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/wunemerawiputawopev.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/zakoburubefabib.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/rolipagedopitijipan.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/75946693986.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/jisuder.pdfIn PDF document text
    • https://cansandientu.net/Images_upload/files/32661274920.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109041324354781.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=nef+upper+intermediate+teacher%27s+bookPDF 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_off0000be61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD678 11180 bytes
SHA-256: 316cf3ce832a02773e664aef638f8a5a0af50a2e122734b247bf7581ba4a40c9
font_02_sfnt_off0000f046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF046 18180 bytes
SHA-256: bbeb42f4eaad2a7e4eaeac4ab17b063b7857afcc8bad98f7807944a4ac8549d2

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