Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ad19f065e05e0eb…

MALICIOUS

PDF

71.5 KB Created: 2021-09-15 17:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 82be3a2ced795d782e9b554e46b6c2ee SHA-1: 214edaed782b87ea33a82781431e92b86454cfa9 SHA-256: 9ad19f065e05e0eb555204865254cb7711fdc98c4a7e9f01a2afbb9f01d09b4b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to disposable hosting, suggesting a link farm or redirection mechanism. The PDF structure and heuristic firings strongly indicate its purpose is to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://catamma.ru/uplcv?utm_term=best+escape+room+games+for+android PDF link annotation
    • http://zsdbiopharm.com/upload/files/49739849600.pdfIn PDF document text
    • https://reniuved.it/file/81236426250.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/zorafoxoromabaxa.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348b55d6940---mefawajugow.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/sebizobexixefezilalusugi.pdfIn PDF document text
    • http://hzosm.com/images/upload/File/48522013556.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/49549791471.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/ribuluxojidalo.pdfIn PDF document text
    • https://kaparatt.com/images/File/nigetux.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/divemoxapegujiritisode.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/lowutoxeseje.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/53235817239.pdfIn PDF document text
    • https://invision.buzyhub.com/files/5853035033.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/vodofulata.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/musefunogikuf.pdfIn PDF document text
    • http://geose.ru/userfiles/file/dezajamufivuwazom.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/78704834970.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/nepumusiraposob.pdfIn PDF document text
    • http://medica-brno.com/files/tokeninuzava.pdfIn PDF document text
    • https://robodom.si/files_vsebine/fojovedezosew.pdfIn PDF document text
    • http://artdental.hu/editor_up/gukegamomumobuwamivedamu.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/80632673428.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/jetek.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_off0000b64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB64A 10968 bytes
SHA-256: 23158030b1b422a853907866fa616a001b02c0afd77ad28c23d967544a5bf083
font_01_sfnt_off0000cf8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8B 16096 bytes
SHA-256: 7b268e61a7bd55a1f08bb8935967c9dfcbaf0f382dd1b78a8a5a1dd7b5834d1a
font_02_sfnt_off0000f80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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