Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f9d4b5df39547d8…

MALICIOUS

PDF

77.4 KB Created: 2021-09-20 09:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c5212ec773fa36ac2d7c0d8c6b9861eb SHA-1: 1db54349bae85c8130b46697d7a1bb1142824d7c SHA-256: 6f9d4b5df39547d8cc926bf19d62f27833e2caa854e7c04a22f9554eab3174a1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads or redirecting users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is part of a link farm designed to obscure the true destination, and multiple unknown URLs were extracted. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://edmo-cars.nl/images/file/46756585753.pdf In PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/93009037798.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0d71a44f1---pipileberub.pdfIn PDF document text
    • http://shopabrang.com/images/files/13859882080.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109030959308580.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/42858599516.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/nokuvuluxojov.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/17719681398.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/votubisabikerupopirorij.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/numagubetutolametalivel.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/napevelovilusorerenetij.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/wavoxamekikomutax.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd7d8e8e95---14318133475.pdfIn PDF document text
    • https://tessuno.com/upload/files/613fe9a98a941.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/27925515707.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/56832129139.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/60882717666.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/rowefi.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/dimomekijopo.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/kupeju.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/todoke.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/vosapan.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/tabibumawavaxuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=deux+mondes+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_off0000c73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4F 19348 bytes
SHA-256: 46e1cda45ef110982015b72613f086a878af20726515dd86b764af8a05307aa7
font_02_sfnt_off000110d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D9 10364 bytes
SHA-256: 1c3f90b3eeb394d57514d3bd7fe1fa71095f8a0938f3e97b6e00a0b2fd143972

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