Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8638e3405ef2113…

MALICIOUS

PDF

85.9 KB Created: 2021-09-22 18:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 558a3fd695177f715187e4b6f77c9cfd SHA-1: cdbb502be3e3687601683186b59d63cb7b6010eb SHA-256: c8638e3405ef21133f835eabb4b485783f9584adfbc1958bc2f38c4c24110514
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript and a large number of external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript and numerous links suggest an attempt to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://pixomot.ru/uplcv?utm_term=under+canopy+rainforest PDF link annotation
    • http://www.majbrno.cz/uploads/files/zokujumoneb.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/86363182860.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/butanikojibumeruketo.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/viwejotojomadaw.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4e2ca5ed6---kijolezolaxibumenepogem.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/789ffcf1a9c1667fe340e9e7d8dc0cb5/kelex.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/nalarufokuxadenug.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/23560349009.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/zomurepijexamemi.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/nosar.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/64857415745.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/84566383734.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/161305c1c815c3---5920141493.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/5555161604.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/xenekoju.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/12886165259.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/lofaligilupo.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/52589689207.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/mesafefolawimot.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/biloduvo.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/pibikimatorogujasigepe.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/rakorolazesudivuvew.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/63243528663.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/zarinad.pdfIn PDF document text
    • http://abcs.umontreal.ca/upload/files/midarudejirusuvexojusoj.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_off0000e988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE988 10688 bytes
SHA-256: 1fc9b942ae9463f4c872a19fd6b1cb4af14857fec62c711f37e2e3f01f3b1df7
font_01_sfnt_off00010228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10228 18384 bytes
SHA-256: ac9bffce7b7a04b3e97caaf0ccdf05c3c92fd058c013608436cb609903d9988d
font_02_sfnt_off000131d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1