Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ba047bb38713de…

MALICIOUS

PDF

70.7 KB Created: 2021-09-11 21:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ca09183181857ba454f1663eb2eceb25 SHA-1: acbd28ffa171230afacdcef3a57e4282ac67ad14 SHA-256: c5ba047bb38713de980b9287df405ba89e6002fbd747250a666545ac447ec873
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to disposable domains, indicating a link farm designed to obscure the true malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript suggests it may be used to further obfuscate the payload or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/96548280968.pdf In PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/kesarunusivul.pdfIn PDF document text
    • http://osayit.com/images/file/55431724340.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/jaraxupewe.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/13472265.pdfIn PDF document text
    • https://durimawar.com/contents/files/jibidefexibanevovemowu.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/58354113116.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/sisopep.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/paviwepelo.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/bulotig.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/bagazuwakuludixegi.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/bidum.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/maxogabufosabekanoxeto.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/fipavobimipururumiduju.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210907215826-tukutij.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/04/jigikosuja.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388869d0b42---nuwatosoguxuvikujamev.pdfIn PDF document text
    • http://traviet36.com/upload/files/zazelikivosudidorosezuzu.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/6978109189.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/dinesiroxubevo.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/dinefalisa.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/43129248348.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/22601639554.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/7097023181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=iphone+se+vs+s10PDF 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_off0000b520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB520 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD37 10044 bytes
SHA-256: 009b7c737881aad94a48d69b689b208a504491ff56c246c9c2f181af76ccd55c
font_02_sfnt_off0000e37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37F 16228 bytes
SHA-256: 67e959f982a3d403800935ebcb798c45fea0ed88aa393cde09d822c62b0d7ba8

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