Malicious PDF — malware analysis report

Static analysis result for SHA-256 02b1c2f526b5530f…

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 11:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 679fa61403dfda3f0aedbe4f428e74fc SHA-1: f1426d3524f9911d441daa0926eaafe51ce01823 SHA-256: 02b1c2f526b5530f871c4e9ba7d5922545a4f3ca79081bea09d914919fb4a78a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. The embedded JavaScript is likely used to facilitate these redirects or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=install+clean+android PDF link annotation
    • http://abdon.madteam.net/ckfinder/userfiles/files/90049603218.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/27273398297.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/73447637758.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/jakuj.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/68362399802.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/fonepaxaranajesevofoj.pdfIn PDF document text
    • https://aokman-drive.com/d/files/pitokexaxi.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090706095380740.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/77481506566.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/zilujuruzexegutis.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/lexepojuvopenupafavegimid.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/gilobizogebebix.pdfIn PDF document text
    • https://ip-pharma.net/data/files/36059906863.pdfIn PDF document text
    • http://northcity.rs/slike/files/27580865068.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/mutiputederonaze.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/95415416393.pdfIn PDF document text
    • http://mopron.ru/upload/files/keravegoligukatag.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/33165661836.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/riposedibunulesat.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/95197628490.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/33592362944.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/85605788149.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/lugawotirara.pdfIn PDF document text
    • https://ntc-container.com/upload/files/verupite.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/fesedomodazusux.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_off0000dbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBE 10316 bytes
SHA-256: 995648b0d357934ca69ea83334b9a37ec2421ab8ba3ff7a07329d42158e62468
font_01_sfnt_off0000f31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2D 18536 bytes
SHA-256: a0064caee1b1f9db878868b2ddba6bcbf1d8f75bf4e15e9734ab669f28358356

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