Malicious PDF — malware analysis report

Static analysis result for SHA-256 116656fbeb68560e…

MALICIOUS

PDF

77.1 KB Created: 2021-09-09 01:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ccb35ad5516837b65db68120ca0a3b1f SHA-1: 9165dab53a9a651d3cdfdbe3f790d1931a293027 SHA-256: 116656fbeb68560e353f21992d5a74ed840c0e19b39a40110d38778e460c2605
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 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 a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://townofwinslowin.com/flash/townofwinslowin.com/file/takemugepomen.pdf In PDF document text
    • https://ans5680.preneed91.com/upload/files/tobuxobaju.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/mudiga.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/325057070.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/81636802949.pdfIn PDF document text
    • http://asqcert.net/files/files/naxoxololazi.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/77534229941.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/zadewibewan.pdfIn PDF document text
    • https://digireg.dk/upload/dukupusebibefamurejej.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/74178099308.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/1359fb8988b1ad456c072eeca5f115a6/54833375945.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/zavovalamiwexolifazumuz.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/vaxega.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/49782147169.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/64089209449.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/roguvuma.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/65069684160.pdfIn PDF document text
    • http://idcla.net/upload/files/rovumija.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/miriziwetisigu.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1630584712.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/11310133410.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/81421454190.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/78809281947.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=download+bully+anniversary+edition+for+androidPDF 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_off0000c926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC926 10852 bytes
SHA-256: bd2a6b9acb7bb3fc6fb2658dfa24c6e17fd3ee802e5bf1a4addb0a4a92323ebc
font_01_sfnt_off0000e268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE268 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7A 16836 bytes
SHA-256: 432d421b649218ead6215dc3e40c9279cadb4fc6fb55561d5691d34d32ee37c0