Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9dbe58fc06bcee6…

MALICIOUS

PDF

69.0 KB Created: 2021-09-27 05:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8ca8a70bfba32cbf834844607f5cd5aa SHA-1: 4589331302d0217373ba210aec26f3deb211d111 SHA-256: d9dbe58fc06bcee667ada99da099eb3a8afd11ecf551bd78cd2e0d8a688fbbb1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external links, many of which point to disposable domains. The presence of JavaScript and the link farm behavior strongly suggest an attempt to redirect users to malicious sites, likely for phishing or to download further malicious content.

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://archism.ru/uplcv?utm_term=adb+connect+wifi PDF link annotation
    • http://studiotecnicomartani.eu/userfiles/files/35685046221.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/24339145696.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/40900602763.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/87974492265.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6c6b89c16---mosezuwijonexebitivuzilu.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/pomobidawoluwamusoku.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/dilumazolu.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/vunadukesupirukiteweme.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210906080719.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/96344036757.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/64979174726.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/84253507118.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/50459931414.pdfIn PDF document text
    • https://frisch.ro/files/file/67911692478.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/wafemomekorojiv.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/96437088760.pdfIn PDF document text
    • http://opersan.com/file/vawanulozigamibizun.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/60427992188.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/1788514101.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/xozenivoparewader.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/dekima.pdfIn PDF document text
    • http://machin.kr/userData/board/file/42586654477.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/dosalaropatoxi.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/75062152807.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/zebunafavujudewet.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_off0000b04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB04E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC860 15444 bytes
SHA-256: 12439a83219656d060b9a2118411648f6310ed496af3c7b2ff2e02d475d9b960
font_02_sfnt_off0000ef9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9E 10200 bytes
SHA-256: 9b057ed6b65dc9169e6769bdee6a44de8c8d74deb420f9f77f4b872e0c150ba1