Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a001d7d6b466b0…

MALICIOUS

PDF

85.6 KB Created: 2021-09-18 11:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e2b6b74945f92f12e9b1034dd6f5e510 SHA-1: 30f4d6fd958429591a11ba08ea364e7d25846caa SHA-256: 61a001d7d6b466b0593042887f9d1a297779294614af5b70531229083e5a5108
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 domains, indicating a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via the embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://qfse.co/images/uploaded_files/ckfinder/files/1630950384_a7ad23a030.pdf In PDF document text
    • http://piazzademarini3ge.com/userfiles/files/57500019488.pdfIn PDF document text
    • https://redac.ch/upload/21352170820.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/jojapowomepadibiw.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/xibudaguxikajobefu.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/26637858880.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/54193328611.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/35960628338.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/wonovibenilopulamokibus.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/zemapibexe.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/62247707434.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/93489444550.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/36513412904.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/naguva.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/82899456902.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/bakofukosisuwafevugala.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/wufavero.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386a98d06ae---tegobapemefuvatoribe.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca91135d89---24554458308.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/sawawuf.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/23935468654.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/23541288900.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/bamebimowajopi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=use+phone+as+webcam+wifiPDF 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_off0000e8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FC 18196 bytes
SHA-256: ec418c2bb8144b6a51f3f3f7b974e7d44ce44a5a8754693dc4f9871455b0a3c9
font_01_sfnt_off00011872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11872 10736 bytes
SHA-256: 40384377420d9b51a66780ddb26e69618b24a2db45997117f757bd80048ccd8a
font_02_sfnt_off000130c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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