Malicious PDF — malware analysis report

Static analysis result for SHA-256 b56a96d6cbf11e7b…

MALICIOUS

PDF

71.8 KB Created: 2021-09-14 13:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 2683b042262ea0bb33e4f784a31c3f64 SHA-1: d69aa13ed8326faa88eedff86d44711eedc8821b SHA-256: b56a96d6cbf11e7b48fb838c89e6d1d2ba87bb0791d01677f08988711fa82eff
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a collection of links to other malicious PDFs, likely for phishing or malware distribution. The ML classifier and ClamAV detection further confirm its malicious nature.

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 http://ekmeta.lt/failai/file/jadulunago.pdf In PDF document text
    • http://ride-on-earth.com/images/blog/file/sitetugubinuxeropiki.pdfIn PDF document text
    • http://bubb.cn/up_file/file/tejufaxivunuwififu.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/32830466948.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210905151814.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/motusoziwexek.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/nugabobikajesidupoxutow.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/pasifodoguwib.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/47227315904.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/42201960689.pdfIn PDF document text
    • https://istanajp.net/contents/files/difenefivelogudegugaleta.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/lebulobako.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d57819d9b8---37432871713.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613b02c6b8e85---jinevelikuralivuz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136481a30e01---65149046807.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021090211582170554.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/53143518684.pdfIn PDF document text
    • http://pk.mo/userfiles/file/depetazomezufokojowat.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/6479298847.pdfIn PDF document text
    • http://sabaparsian.com/ckeditor/files/files/25914553716.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/16373660164.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/tijiwiduwafeguk.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///8930821023.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/89019786156.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=tv+operating+systemPDF 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_off0000b9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FE 10692 bytes
SHA-256: 6148f295b0a31a7c385edbd5a9d2673a5d74b6618231d020be0058451dd07457
font_02_sfnt_off0000ea91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA91 15316 bytes
SHA-256: 23c242dd3f4092f90fa5d3e9c83b342914e72ad6c8c2f88d9811ca4c15f3a846