Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e1d2d5bb5aa4666…

MALICIOUS

PDF

80.0 KB Created: 2021-09-12 12:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fe22b2e961fe1a090fa902ed006cd8c9 SHA-1: f46f731a42414ba818bb797c6fb5103b170ccafd SHA-256: 8e1d2d5bb5aa4666beb44cc75e7b294694458d65259473ced9572802dbe949ff
134 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript, suggesting it attempts to execute code within the PDF viewer. The presence of numerous external URIs, many pointing to PDF files on various domains, indicates a link farm or redirection mechanism, likely used to distribute further payloads or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161365425591ef---duxebusekavodujurutanug.pdf In PDF document text
    • https://cyberbirddog.com/userfiles/files/kidojiwixexonemedu.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/15353291992.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/34071912343.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/24e0947dcd56ed9f1fca120a7c8fae1a/sakipem.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/19856888153.pdfIn PDF document text
    • http://js-space.de/userfiles/file/nujiduvomavuzumevuxem.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210905110829.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/25461755905.pdfIn PDF document text
    • http://scantech3d.com/files/lidap.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/xajafe.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/82643019332.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/pononu.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/damugilakosa.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/mofugiluranifo.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/nimaxoduzibigogedali.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/6241460966.pdfIn PDF document text
    • https://camphacement.vn/upload/files/tewedaz.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/levajosololapulokexezetu.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/bosezuze.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/86326964748.pdfIn PDF document text
    • https://csodamalom.hu/files/files/levosolodipebukubixutunin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=video+downloader+for+myflixerPDF 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_off0000d247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD247 18908 bytes
SHA-256: 172d45b8ad088589ef23eaf0a3dac376449b76a425cea47640c7d07e444463d0
font_01_sfnt_off0001032e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032E 10520 bytes
SHA-256: efbf1d78af9d4f97437b05f79f7978bd19b13f8d055887e76c13ed5da5f66f18
font_02_sfnt_off00011b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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