Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc7957e0a74442a…

MALICIOUS

PDF

68.4 KB Created: 2021-09-25 01:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0aa257fe8dd55dd92f1a77a99525d746 SHA-1: 5e506c0eeecf5b3c350e1bbf0177394577a4dd83 SHA-256: 8bc7957e0a74442a4cc832e02702c8217e04107d9a9947fc19bff3e2ffb36632
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute malicious code. It also features numerous external URIs, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chcial.ru/uplcv?utm_term=parallel+space+original+apk PDF link annotation
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4eef9f191---timiguwitowabifis.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/70642492231.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/vurulux.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/32201601962.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/fogadufepevujajatiridu.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/xabajivanusavanud.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/63267136789.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/76943932511.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/polixododudaza.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-8/20210908101558882075.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/goponosijo.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/62020867022.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/28158787450.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/72389872763.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/nsrs61i83pvaemgn729lrp3ob1/jetaja.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/32243423089.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/981088966.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/tadox.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/sitexupolupuwiwi.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/loxatatigafalovi.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/37487902542.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/dovotasedafefugim.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/96142094370.pdfIn PDF document text
    • 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_off0000ad87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD87 15096 bytes
SHA-256: bac3c1194b08fdec864ebce9cecfe6f1dcc5ae927cc03d5a4a17607ba14284ef
font_01_sfnt_off0000d3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E0 10544 bytes
SHA-256: 52cfcd4b808ea9d911a49a994f32e402343fcd703c1cf0016d2fff7bbe108fb1
font_02_sfnt_off0000ebfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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