Malicious PDF — malware analysis report

Static analysis result for SHA-256 e169bd2ce4c543af…

MALICIOUS

PDF

69.1 KB Created: 2021-10-03 13:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d8c0d0646ed6ee2fe050f003e2690c07 SHA-1: 2a0e45d836b23c7dc56b126d04adda85cb8f0f37 SHA-256: e169bd2ce4c543afcbd3b387fa7fe752511b95162c12180e984b0091a4f29976
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to obfuscate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=prunes+and+water+for+weight+loss PDF link annotation
    • http://khaskhaan.mn/uploads/userfiles/files/40588412893.pdfIn PDF document text
    • https://extractos.assaludips.com/Proyectos_PHP/gestor/images/file/mebukazadufimodowo.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/zapekinetasibiperopo.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/9129dee4834e2709bd269aad980427e1/darelamadurepedemekigavu.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/debewiwolava.pdfIn PDF document text
    • http://pcparts.fr/ckfinder/userfiles/files/nekozumefanuta.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/sevaluzusovelef.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/lagojojupuxixegetosuwol.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/winewov.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/tiniseruwusejogesu.pdfIn PDF document text
    • https://termoformat.md/img/files/tirulikimoxiragapivofok.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/37191859410.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210902115615879.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/56619218009.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/zugelifofipadivovo.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/bobobotavanilotuf.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/zamonodujutuw.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/35870547587.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/92387022117.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021092516435473499.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/mexopamenuvepevaxade.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/33043210597.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/tumarotepaloxetawoziva.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/zekozinafof.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/92661216201.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_off0000b02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB02C 10820 bytes
SHA-256: b3ce59ea89bf770935337c437451cd2b6fdfb10f9b7e27ebb39b95eda716f280
font_01_sfnt_off0000c8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8ED 14980 bytes
SHA-256: ec065b710515a428b827a00c86b8395f953f68a2afcb691004f2f04c8bbf8d27
font_02_sfnt_off0000eeee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1