Malicious PDF — malware analysis report

Static analysis result for SHA-256 08bbc77a2a0c5b08…

MALICIOUS

PDF

72.4 KB Created: 2021-09-18 04:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 35a053bf2706df152dba54288305e286 SHA-1: aba8bb12e1a09b2106bbe1b2391adf08687a47b7 SHA-256: 08bbc77a2a0c5b08e7a17ea91d7682d7933bd8a07dda618e161227d010d14bd2
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 potentially disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. The presence of embedded JavaScript (T1059.007) is a common technique for exploiting PDF vulnerabilities or initiating redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://jncs.kr/page_data/file/20210902220001.pdf In PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/xofosofovomaw.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/89490683128.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/sekenigebitoxig.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/41829320493.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/fovujasupowopumutidoko.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/72940153225.pdfIn PDF document text
    • https://primer-spb.ru/files/files/61953273517.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/15017398320.pdfIn PDF document text
    • https://protrialse.eu/files/files/jabigokaromolode.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/41615928701.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614389eb88527---losunagidumolugo.pdfIn PDF document text
    • http://wirheiraten.de/images/file/kokup.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/4203780761.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/vabizelutaramuruku.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/wurizaguzanarejete.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/49326823747.pdfIn PDF document text
    • http://watch62.ru/files/files/43264406113.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/jajuzebasunizotosut.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/19899552077.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/55751230983.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/bewejulunanamopekowuma.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/defulajenetavaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=reading+test+for+intermediate+level+pdfPDF 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_off0000b940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB940 16216 bytes
SHA-256: 9759798d998e0d4fb2e7259d446b56fd550e1b6b0b4712c7c15036379efdba3a
font_01_sfnt_off0000e26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA83 10952 bytes
SHA-256: 79f22c4b8781946fd6e7f38c4f82d5799ce32b057fdafde6f1641e738c073c12

Open this report in the interactive analyzer, or submit your own file for analysis.