Malicious PDF — malware analysis report

Static analysis result for SHA-256 225597bfc24b8005…

MALICIOUS

PDF

73.0 KB Created: 2021-09-10 15:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cbae69d6a2a35380817b94ad716a30a0 SHA-1: 31ecbb3628be0bdcf9e5c932e557497c7e9d16d6 SHA-256: 225597bfc24b8005ff424c39975baf49288dba7b880d00d40aee7d164001ba4d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous embedded URLs pointing to various domains, suggesting an attempt to redirect users to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit users by directing them to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 http://klgd.spokoino.ru/i/upload/files/tatazinolexixuxixino.pdf In PDF document text
    • http://www.tramag.pl/upload/file/82288476663.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/51617968146.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/20312293809.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/lananovobapo.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/93774167054.pdfIn PDF document text
    • https://somogyplusz.hu/files/dipalejomodezasamigikajix.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/71571443014.pdfIn PDF document text
    • http://secoinblock.com/upload/files/wuzaxisibekamu.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/18229430060.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/zapekomonogibenuve.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/janutanejefi.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/tepimebunulivuju.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/filud.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/6759578535.pdfIn PDF document text
    • https://arendic.cl/files/givazu.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/toxebametuxejire.pdfIn PDF document text
    • https://derfo.info/resimler/files/bexalutubumixelitu.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/kabixolegifavagemeze.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e7aa506fc---43082657203.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/jujizibasenof.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/31333267455.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/vifidojanekapudolik.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/nubugekira.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135cba4af279---60019822827.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/43128431277.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=hart+of+dixie+123moviesPDF 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_off0000bbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB6 10868 bytes
SHA-256: 304a6bdfebb211ac947740e5597106fbd1c2f513f6b806e3549281fa0bbbd1ae
font_01_sfnt_off0000d506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD506 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED18 16072 bytes
SHA-256: 7f4223b4dd5bc17498835d036ac23d6bc280871d205b3a2d6caaa5e319ef543f