Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5712d357ec63d28…

MALICIOUS

PDF

84.2 KB Created: 2021-09-18 05:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 86c21fa45f37c4803f9113f8617d9fec SHA-1: 5857cd177943e17bdd1061a96f91f721ab69f699 SHA-256: d5712d357ec63d2898c8c2619a113a3fa524ae2b187c90a79eaf343935c33d5f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links pointing to various domains, many of which are likely disposable or used for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/npdsiobfufkaph65gtuu9toar0/98036441697.pdf In PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/kobuvixudazazofapovuz.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/51325753001.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/vifitodofotod.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/bumakamerewozibaxopude.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/35091056749.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/pamobeg.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/29003486912.pdfIn PDF document text
    • https://portofcrotone.com/dati/upload/file/xesopuvamevesopoxoda.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/bininudurawesa.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/59633235922.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/52382132024.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/pulilomapumawigujulaxaso.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/tulijisiso.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/pudomigajikotajefepa.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/32171478239.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/nafulezozexuwunadu.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/ca940978b0b228deae01363ca08fe5f1/37252068093.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/xazosivis.pdfIn PDF document text
    • http://vitrine-prof.com/files/2997974855.pdfIn PDF document text
    • http://goldmustang.com/files/files/funudurujina.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/14480686886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=fts+2020+mod+fifa+2021PDF 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_off0000e63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE51 17576 bytes
SHA-256: 530dfa2b7235064d225bc13909a1b6179a727bc7c7a3e854b5b0d41ba1ae7c56
font_02_sfnt_off00012b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B85 10404 bytes
SHA-256: f0099d23f9888a54c4d89b3022afacfe1908bbd6ffdde11e9de8e45397e8aec2

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