Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b397ac32af6c06b…

MALICIOUS

PDF

71.0 KB Created: 2021-10-03 03:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2aeec2b262ef41cd49a086e0c08af545 SHA-1: 3ff7f4298282c4af20fe2817f82655dd82cf4d86 SHA-256: 4b397ac32af6c06b60e5865d9dda61b93fbfab524b5df707cfc815fa2f05981a
174 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 domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://charmingcurls.se/upload/file/33506851611.pdf In PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/50566447791.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/88891350334.pdfIn macro / runtime command snippet
    • http://toyotarent.hk/FileData/ckfinder/files/20210909_E0241CD19532DC84.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/ca69b4be537c544bb35ad9534cfcf710/rofedojamusaw.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/30017009841.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/xixeju.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/33f3e52115096855c3ec59c1ed17533d/61347595023.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/5625189915.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/bojaveluzinabe.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/11/kazula.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/werukitakatemi.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/26430341383.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/xikaxevoma.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/relewamikujuvo.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/23834083325.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/82141795651.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/15580122426.pdfIn PDF document text
    • http://www.polni.si/Images/files/zuxude.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/77592601827.pdfIn PDF document text
    • http://hotnews.md/upload/userfiles/files/59338781057.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kawazofepaxexi.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/16775793774.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/muxapamovowe.pdfIn PDF document text
    • http://okna-dvere-onlinIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=lil+yachty+and+tyler+the+creatorPDF 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_off0000b257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB257 10368 bytes
SHA-256: 121348c4cdb66374e0f6f43b5e7d32a8dd91ba629cc06b5b31b0efa544ad20cf
font_01_sfnt_off0000c9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B4 16624 bytes
SHA-256: 18f70b6f314191597f9c1bb7a99d6c7ea87867cf3a1c4401af14e303eef92874
font_02_sfnt_off0000f421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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