Malicious PDF — malware analysis report

Static analysis result for SHA-256 eef11fde53a5ac20…

MALICIOUS

PDF

80.8 KB Created: 2021-09-13 05:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ce6967b095f82934c33411418d3b6b96 SHA-1: c985f33ac720009a6f22689ede0f060c730ac6da SHA-256: eef11fde53a5ac20ee67cc44fd7dcfec50d2a2314790c377a010c9cd35bd9870
166 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm designed to distribute malicious content or phish users. Heuristics like 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://cructi.ru/uplcv?utm_term=adelaide+floods+today PDF link annotation
    • http://medica-eg.com/userfiles/file/rilunogiz.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/jolakulipuvo.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/bojexitiw.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/72972554421.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/79258214038.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16131979a8d30e---61736802094.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/58516007472.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/20174311378.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/jakujotopuzivi.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/gikeg.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/gogifukufagina.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/fuwevekewofod.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/11878560174.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/24955809001.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/sanaxol.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/xepol.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/20381658850.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/vulave.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210910_004853.pdfIn PDF document text
    • http://wenxuezj.com/images/File/tupupibuwi.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/16941561770.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/supobupixujuvu.pdfIn PDF document text
    • https://medlineplus.gov/floods.htmlIn PDF document text
    • 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_off0000d70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70E 18432 bytes
SHA-256: e92ff8b737a7278cb0367a27545b2f65080746f7e5d04f40117fac71cd99b876
font_01_sfnt_off000106de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF5 10236 bytes
SHA-256: 9fec8cf3c3b3b9b9389509d7fe56f76211e600bf70b4821aee7fc4705aeeb818

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