Malicious PDF — malware analysis report

Static analysis result for SHA-256 4adb63fc00adc025…

MALICIOUS

PDF

71.6 KB Created: 2021-09-16 05:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b0d405ad9c2d53ea9ff630de353c8e26 SHA-1: 2d486b5f9899b1869c6332b3231afd6c27ac093e SHA-256: 4adb63fc00adc0253f8b7a3da6c32d1d4a7a79581e0f9980db01fdc06513a093
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm, likely designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://takipbizde.com/calisma2/files/uploads/pafejujobe.pdf In PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131dd0a95c7d---sobawerebotisosabefudisop.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/63309984672.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/rideranisamawiw.pdfIn PDF document text
    • https://rubfila.in/files/file/xugabedowo.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/74349418939.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/63638665980.pdfIn PDF document text
    • http://knipia.com/userfiles/file/xukeseje.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/02c36a6410350689ac7c327bd4481329/xiburubu.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/dukefozeg.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/tapaputowenufu.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/pogokepiwurejag.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/disosukokuj.pdfIn PDF document text
    • http://93564497.com/userfiles/23917306481.pdfIn PDF document text
    • http://beijingteye.com/upload/files/jidogibuwizamebejirezijo.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/42226041404.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/26743259950.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/59354138084.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/favizomerab.pdfIn PDF document text
    • https://sapporopools.com/contents/files/54196748143.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/81505815334.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/devinenufimedebi.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/30323465058.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=download+gb+telegram+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_off0000b20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20D 10792 bytes
SHA-256: 3d9739caf0141dbf48fd386c009b6185ddf44bd4b1f22f7c544f8b79853cd78e
font_01_sfnt_off0000ca86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA86 18136 bytes
SHA-256: eba6c6f712f385fcbad988d6dee755a851d03aca11d720b6e9738604e7cc0c20
font_02_sfnt_off0000f891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF891 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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