Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4cbf1eb46fd734…

MALICIOUS

PDF

70.6 KB Created: 2021-09-17 20:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c2a6496dca44fb8e14ce6439c70368a0 SHA-1: 81de223d464c1f1684630e2d840d2e6324d62649 SHA-256: ac4cbf1eb46fd734d472092ee5b0c2d87845be518daa488a42eafb78e9f0fcb9
142 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of JavaScript suggests an attempt to execute code, likely to redirect the user to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hz-karavany.cz/ckfinder/userfiles/files/duxuxuv.pdf In PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/magufevexedatewodej.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/malazewovuxapo.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/70516867651.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/mefeze.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/58365859345.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/55617030743.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/tirinadotuzuwixuxokegul.pdfIn PDF document text
    • https://davnosti.ru/upload/fobexixana.pdfIn PDF document text
    • http://coumert.com/images/file/49333128612.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021091607272880554.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/gupigudatoke.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/25678904725.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/mitojazonosofajod.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/zowaza.pdfIn PDF document text
    • https://fasleh.net/Files/files/galudepebizetogemuset.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/liruzarumo.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/64873758641.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/jabikugagofukupedabem.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16138e3aac7f72---2726160958.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/mogonujikufixovigimetu.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/dokevaguma.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/38863716840.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210914_7A0FEB7112DC114D.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161311519de49a---loxovubajer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=free+fire+game+online+play+android+phonePDF 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_off0000b5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB8 10768 bytes
SHA-256: c8404162ba1d7d75e75c0147306f0ac0a3f3678a0b1056143fe47fcd37a31f69
font_02_sfnt_off0000e5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FE 15332 bytes
SHA-256: fcf2f7edf98b9a67d02c097fb9aa26204c63ed692eb334eabab0190fe67652c4