Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d9461493db6491b…

MALICIOUS

PDF

79.2 KB Created: 2021-09-16 20:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e5ac33cd8a31c5e35c547baad1d252ec SHA-1: b45bc17b511d39a4d905ae7918ca2e225a102a8c SHA-256: 7d9461493db6491b977f7c9b15e84442f7852919c4aa54371456e25cb8073dc7
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via the embedded JavaScript and the extensive list of linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://hatowo.com/app/webroot/uploads/files/mefunaposunilew.pdf In PDF document text
    • http://kesifveotesi.com/files/46382132717.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/34536560794.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/7321324712.pdfIn PDF document text
    • https://kiptep.ru/file/fiwukavojotuzusu.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300e6f83cc3---63614541164.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/25127845547.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109120259089511.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/vaduzu.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/55418059059.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/jotubenasoserosewedop.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/bitotefulekewisori.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/57653960878.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/lapasupe.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/vasalomelisoviga.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/26190780637.pdfIn PDF document text
    • http://annabarons.com/files/files/71315108980.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/texojukorawonuneve.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/vabepuserazinixafexap.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/buruledikimexali.pdfIn PDF document text
    • https://ms02bet.com/contents/files/ruguw.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/65224763821.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/mikar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=leonardo+da+vinci+talents+and+achievementsPDF 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_off0000d510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD510 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED27 10656 bytes
SHA-256: 9e80c02f04ab5eafaf19882b03f97d7a03fe8b5adee0ca88ce67e3439ab093e8
font_02_sfnt_off00010556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10556 16040 bytes
SHA-256: 6e0db95fe6a0d6567b64d71b09ce4481105089ae51b33141aca1a7ce54ddfc80

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