Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d9bcf98bace7dde…

MALICIOUS

PDF

85.4 KB Created: 2021-09-22 15:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 661211277d113a1d4bcb23b960546276 SHA-1: 680d2384a84ee1765eb19e45bd0598a803bdc4e9 SHA-256: 9d9bcf98bace7dde024feb28ca8316db2b794137f1450b8818094e3072038f56
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The presence of numerous external URIs, many hosted on disposable domains, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://unseretochter.com/images/file/revawatatiwaj.pdf In PDF document text
    • http://lexus-custom.com/js/upload/files/xesomenotaramufosa.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f024064cb7---tolewunigubuwux.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/70504167475.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/dadanag.pdfIn PDF document text
    • https://drlanda.hu/user/file/91679011639.pdfIn PDF document text
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/81809294201.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/66272770662.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/gafudadaripilimez.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/tafomizelijefo.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/maxibisifarawetivanutaf.pdfIn PDF document text
    • https://vendax.ro/files/file/nisorubewafoxegilugi.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/mogijofavidakifi.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/82231164420.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210921_2642870AC2952733.pdfIn PDF document text
    • http://chongros.com/userData/board/file/45978487206.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/mopad.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/rujojudoved.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/22319220911.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/mawireboronegidazuwi.pdfIn PDF document text
    • http://loxocongnghiep.com/MINH/user_files/file/43699316344.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161493dec3ff24---dodowakapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=audio+games+for+androidPDF 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_off0000ec93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC93 10632 bytes
SHA-256: 02a260646492771dbcf3b4f3a74be20d11e7aeb9e5bb44b1567c362e33bba8c7
font_01_sfnt_off000104ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AB 16752 bytes
SHA-256: f8e1540fbd1b267ff04cd9c3561abf93753336c652760c6b4e85d4a4672412e4
font_02_sfnt_off00012fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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