Malicious PDF — malware analysis report

Static analysis result for SHA-256 4719bff84964dcc4…

MALICIOUS

PDF

82.6 KB Created: 2021-03-19 22:53:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 2216d35f1aa1d8daec319098e8d64c03 SHA-1: ebd914da919fd4cc43ca81e8b1378107ba6a33d7 SHA-256: 4719bff84964dcc48d5343418e8a46467f750af103dc6849242aa5c5f5ac60b0
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to distribute malicious content. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document likely prompts the user to install a fake browser update or extension, a common tactic for malware delivery or credential theft. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://jumiwimov.ru/strik?utm_term=reboot+rt-ac68p+manually PDF link annotation
    • https://jowiginuzag.weebly.com/uploads/1/3/1/4/131438641/nejajizori_bujigaw_gibiv.pdfIn PDF document text
    • https://wobozosexeje.weebly.com/uploads/1/3/0/8/130814788/22ec7f836a1a28c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413850/normal_6000e4f3c3b45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366395/normal_604a2061a0d89.pdfIn PDF document text
    • http://idealica-italiauficiale.website/finding_perimeter_worksheets_3rd_grade3jhw6.pdfIn PDF document text
    • http://j3vnci4.xyz/chromedriver_old_version4ubq9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491670/normal_600452c54fd56.pdfIn PDF document text
    • http://belplitka.ru/what_is_the_best_trigger_weight_for_hunting4mj73.pdfIn PDF document text
    • https://wikagigodoxuf.weebly.com/uploads/1/3/2/8/132814929/toduwulumedadojarafi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xupimaral/74239589243.pdfIn PDF document text
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_9684c72914c9475ea1b864ff41da0c5e.pdf?index=trueIn PDF document text
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_a792f8917f5a4d19a660578ba0128ca1.pdf?index=trueIn PDF document text
    • https://f38be386-5799-403b-9303-fb121113655a.filesusr.com/ugd/6f1aa7_401fc14417bd41c78a70d77ab2119f59.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mutirexa/statistics_david_freedman_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/pepurawu.pdfIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_6f065e519a8a4fc59418d4300d59f2d6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/eta_full_form_in_software.pdfIn PDF document text
    • https://b1b1ed1d-a631-407f-b8a0-2f609481a9c2.filesusr.com/ugd/3e5895_ae46aa6226a547f6a64f6305a28316e0.pdf?index=trueIn PDF document text
    • https://5fa60de5-32ab-41ac-ba65-77330e21e623.filesusr.com/ugd/2e16aa_28e8f05a93cf4be2b516b4347a7db74d.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10468 5528 bytes
SHA-256: 35b4143480e550273f6b3a5ca5668c8c712b4568ab5c64d190890d172ad387ee
font_01_sfnt_off00011729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11729 11428 bytes
SHA-256: 38e73a50f078c7e71246da8291aff073d89f16407aa3cb136652a90fb8c13cf8