Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5163fe13680d126…

MALICIOUS

PDF

79.4 KB Created: 2021-09-08 13:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f05a8e31325d94f949f1f059c9803151 SHA-1: 3a85b3cc9789a8aacd67748d2b652769e5d91c08 SHA-256: f5163fe13680d12677ae8af4683e6ec5b9e1b3509cabfb9ca9facdca07bccfd7
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are hosted on disposable domains, suggesting a phishing or malware distribution campaign. The PDF structure and embedded content are consistent with attempts to disguise malicious links as legitimate documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://nomylo.ru/uplcv?utm_term=family+law+rules+2004+pdf PDF link annotation
    • https://bazab.ru/ckfinder/userfiles/files/renepobe.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/57967210738.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109031637115886.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/39025637166.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133b13248ab4---luxiwi.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/betan.pdfIn PDF document text
    • https://denimder.org/resimler/files/90363595173.pdfIn PDF document text
    • http://ty-int.com/files/files/91184748416.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/mogev.pdfIn PDF document text
    • http://epicridesnepal.com/files/73891273188.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/77356775868.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/nukozen.pdfIn PDF document text
    • http://ifap.it/images/file/55786169355.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/litopelalameset.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/10979346582.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/rijom.pdfIn PDF document text
    • http://timebymtm.com/upload/files/ginenimajopezaluj.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/99763539219.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/fikabelodugub.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/79963236712.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/10240754261.pdfIn PDF document text
    • https://onlinendttraining.net/files/wimifizafinelomelulebu.pdfIn PDF document text
    • https://dom-titan.rs/files/93644677039.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210905161457.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/bujuvolewiborunitisepow.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/dufowoximazo.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_off0000d191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD191 16964 bytes
SHA-256: da1c5d68083542d7c95a6fb4e592053ff72f36e8227918af80cfe0b23e8a9461
font_01_sfnt_off0000fc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B3 10932 bytes
SHA-256: 60c81f568166dfe8384c8e927c8e5b8afff0c83c0d020ca00fa6cf522c58cd9b

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