Malicious PDF — malware analysis report

Static analysis result for SHA-256 c32f36c97c7ea323…

MALICIOUS

PDF

78.6 KB Created: 2021-10-01 05:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 22d84cae6e03f948e4376eecb8f8664d SHA-1: 1078f88cfdc072a5082782e877a63873132fb0d3 SHA-256: c32f36c97c7ea323510ce4c7e6d59131b17c48f63713aaf8edd91fe8c855be10
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to suspicious domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm structure, suggesting the document's primary purpose is to redirect users to a network of sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://jinyezi.cn/upload/45425522307.pdf In PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/vugaboniniliwud.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/21114554977.pdfIn PDF document text
    • https://majubesar.net/contents/files/95249717527.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/jubidosibebuw.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613626cd3d304---sumodo.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210928024950.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/samuzitariwozenekigeju.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/tumavewomis.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/jazewidowonawepabuv.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/zamagefewaviguvuwip.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/4907624670.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/ridekuzibedemun.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109042153415837.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/22608905412.pdfIn PDF document text
    • https://umartravel.com/files/15443777623.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/fuzoj.pdfIn PDF document text
    • http://infosierra.es/images/editor/kuwomadabiselidefol.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf62fcf936---sofikovonokozil.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/sizizolirosafe.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/womokobufapalupajadelivo.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/kejik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=xiaomi+mi+10+lite+5g+antutu+benchmarkPDF 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_off0000c546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC546 20304 bytes
SHA-256: 37083d88d335a33e48fae956aeb681cbf9d19479588cc12dc0278084ad665f2e
font_01_sfnt_off0000f8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11107 11156 bytes
SHA-256: 549e250290e160bcc6849eddfb017424b698e3cf2ee7f7547251400a85bf977f

Open this report in the interactive analyzer, or submit your own file for analysis.