Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c78fd1f6885830a…

MALICIOUS

PDF

69.8 KB Created: 2021-09-27 08:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 97c635e74b4bc24943064744712ea2bb SHA-1: afd0ae0a2c2fe01eee34a05b604ef4c83e969305 SHA-256: 9c78fd1f6885830aeb8a14d3435802becbc7d26a4aaeb9c8fab3cd715e018597
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to T1059.007, and the overall nature of the file suggests it was delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://huntic.ru/uplcv?utm_term=beamng+drive+game+for+android PDF link annotation
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/kasamulilovurepeg.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/40053926299.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/kokefejegeza.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/muxiwupirumaj.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/texuzedapopajuwekegaja.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/6731286994.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/mubabapofatuxog.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/kijidexuravumonugonifuze.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210902110830.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136ab3ef0ca5---tuzunov.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/gagewokuwinudiwusizo.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1614dcfcab0082---ditivimanewavowivak.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/93181290377.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/40602720292.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/10388974634.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/11326464421.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/rezafaxew.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/23120707250.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/jasitulozeroxejekuv.pdfIn PDF document text
    • https://kimcert.com/E/file/tovofizimijunusupifalo.pdfIn PDF document text
    • http://biosite.ru/images/news/file/46244938431.pdfIn PDF document text
    • https://asi-filter.pl/files/file/jututatu.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/9474257457.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/zonematibemekorakitukuv.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_off0000b010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB010 16680 bytes
SHA-256: 536372cce1ca97517bbe5a5123f4926c8cf9fd99cc7f2f3ac9b9863c7992e028
font_01_sfnt_off0000da3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3E 10504 bytes
SHA-256: 45386471a0a31f8a31a6a4c131e0e214d903dfdbc8ead203e6165350a9d05b37
font_02_sfnt_off0000f1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1