Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef3e421558dc54b8…

MALICIOUS

PDF

77.8 KB Created: 2021-09-26 22:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 000f21a5c4c011201524c341d97ea9c5 SHA-1: f78aa6e0d985ca4f92288d67088e7032c313972f SHA-256: ef3e421558dc54b8e193addcbd1708abf16ad4346212cb285cb2a9a8299cdd7a
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains a large number of embedded URLs, many of which are hosted on disposable domains or are part of link farms, indicating a strong intent to redirect users to potentially harmful sites. The presence of external URIs and the 'link farm' heuristic suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://medvor.ru/uplcv?utm_term=mortal+kombat+2021+soap2day PDF link annotation
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131dafbf16a7---wutidusujoguwesudadi.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/liroxagul.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/10602880900.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/31156885346.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/sesuwiduwekofonitar.pdfIn PDF document text
    • https://pcetravel.com/files/file/sozeruz.pdfIn PDF document text
    • http://proxima-online.it/public/file/46277122082.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/luxegiloximonufa.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021092603030442.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/rupefafovafubovajinufug.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/bakupepalofe.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/turosodujalipaga.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/81354371733.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210904105246.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/zopajavigeja.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/buvetomalurebisi.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210915_836629BD3CECE42D.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/38948335745.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/26918959315.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/wugodolowopejej.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/takumewixadatenifolumuwo.pdfIn PDF document text
    • https://nichebearing.leaddeehub.com/userfiles/files/98324170162.pdfIn 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_off0000c107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC107 21676 bytes
SHA-256: fc0aba577c81aeef56e0e8d2af95493e988255770f9d79f07e45b5ae08d17f7e
font_01_sfnt_off0000f943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF943 10860 bytes
SHA-256: f5058e88ba8ef83c76d55baace6a80947db0ae11ed39d045307a24119af4dd36
font_02_sfnt_off0001124b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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