Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cb7a130ba15a5bb…

MALICIOUS

PDF

83.4 KB Created: 2021-09-17 19:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d1af2c08207e576fbdb7a05765359cae SHA-1: ea0d8a368635a0f5bc10bc3d6e6cfd734dd1f128 SHA-256: 0cb7a130ba15a5bb824e50e74fb50977d8fcecfb77fdde3fed8db70e2e657cd8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs pointing to external domains, suggesting a phishing or link-farming scheme. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://oniceh.ru/uplcv?utm_term=town+ideas+minecraft PDF link annotation
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/daxim.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/10045124598.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/nenoneberekedude.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/jufepovenu.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/rivamura.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/61169935373.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/17260018609.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/83305784689.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/56791147738.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/zutitigimekewekavojew.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16137e8cbc071a---87369792171.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/52266186848.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/mafusodasurelatogudixoged.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/47842122813.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/bizolepudivalivom.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/78176722080.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613651e15767e---44233753181.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/repelebekiwijoji.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/resokuxozekozifevufap.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021090110582173499.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_off0000e28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28D 10640 bytes
SHA-256: 82e10cbd1fe5b2000506564064f578795689b9ade86eeda90281bf410e7d450f
font_01_sfnt_off0000fafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001130f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130F 17812 bytes
SHA-256: c06a876315e568a6a2f919d02aa51dbeb68c7dc7512555a7bde7a802c788ee9d

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