Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b76437544681f4…

MALICIOUS

PDF

75.4 KB Created: 2021-09-10 19:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ebde1f4123243d1116f4471c609354cd SHA-1: ada42e2e649ffd09f82f5ed948d345116405fc46 SHA-256: 31b76437544681f42d66ba8b2d818dfe7441e54ca882d6e9b05c7db8540eb9b8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://agenziaimmobiliarecannavo.eu/userfiles/files/1657418969.pdf In PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/65163156314.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/18614912469.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/74716062861.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/fajewimu.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/16038375846130179e4f0ad.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/84547919644.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/xunifomofeneve.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/47155146380.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/379cd3984c4e5c15a4cd824a98b9f9a9/25782713316.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/pufigexuludofubit.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/nuwobijebofabesovo.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/zodurizetudenasolexe.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/nifibadutujatibowasu.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/xufijonime.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/sakifixuvosapef.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/52204148595.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/bc36fb2645d29a981332bb9dd2c56312/46157647887.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/nuxuw.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/xatolalikavopigabew.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/webijaxel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=jaya+janaki+nayaka+tamil+movie+download+tamilyogiPDF 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_off0000bebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D5 10804 bytes
SHA-256: f02c601b57741bdf88fd6ad728cf80747075421030f964c30046bfac5ac20c34
font_02_sfnt_off0000ef80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF80 18488 bytes
SHA-256: e4d439b5ad9b6da0236cd5df43de6b60e3483376af2e62ebdaa0738ef9b26db0

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