Malicious PDF — malware analysis report

Static analysis result for SHA-256 780e5c5711f24be3…

MALICIOUS

PDF

72.2 KB Created: 2021-09-18 01:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 879eaa9738b7e036d664cdace18c8edd SHA-1: 80461fcf4064700cd80d83496e16840c4948636d SHA-256: 780e5c5711f24be36e66c9f90d2adec281d2bc9d932ab5261780c9186360dcf0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to distinct hosts and configured as a link farm, suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.
  • 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://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bogibulozix.pdf In PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/91919413938.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/gibavufawupij.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/74642009615.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/pumuzu.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/63457746551.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/85158488563.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/zugimedovos.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16133dab20921c---26827476221.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/14485042776.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/fadijizomitavenogijikenu.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/44846250549.pdfIn PDF document text
    • http://arhive.np-sp.ru/img/file/venowazup.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/negebixapam.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/9987742d992d37ec895c3881b1c2deac/munomavumofi.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/fopejunomenasojuwados.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/27449914657.pdfIn PDF document text
    • https://medpressa.ru/files/file/relidaj.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/berimitekupu.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/67308921042.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/23078373377.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/wibifusirenuni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=planner+5d+unlock+mod+apkPDF 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_off0000b947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB947 10644 bytes
SHA-256: f4819bc84480b053dba10f21f487a19e451e17cfe5be4062af8308692e9dc6c9
font_01_sfnt_off0000d1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A5 16224 bytes
SHA-256: 4bbedce3e2dff3990a3794e481a2ff8f9afeeebb2518ac6d273508c78b1f64b1
font_02_sfnt_off0000fb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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