Malicious PDF — malware analysis report

Static analysis result for SHA-256 41be0c811fc37c9f…

MALICIOUS

PDF

72.1 KB Created: 2021-04-02 08:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ea3a84522cb8a8efa94f496e9fbae138 SHA-1: 72041aef93653e22a08865f72cc0a1c4b28bbb72 SHA-256: 41be0c811fc37c9f9e0a60806337e295c13df87b30d8fd86250898ac93913a28
244 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the presence of multiple unknown reputation URLs strongly suggest a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the link farm and the ML classification point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://yafferge.ru/strik?utm_term=el+espiritu+de+dios+esta+aqui+letra+y+acordes In PDF document text
    • http://tuderoba.getenjoyment.net/96034249759.pdfIn PDF document text
    • http://dosijefa.mypressonline.com/lupazuvawomojenif.pdfIn PDF document text
    • http://ligumexijigab.getenjoyment.net/jadibopubelul.pdfIn PDF document text
    • https://guzoxufogoxuwo.weebly.com/uploads/1/3/4/0/134097696/29510968de1e9.pdfIn PDF document text
    • https://lajexupizad.weebly.com/uploads/1/3/0/7/130775806/3926199.pdfIn PDF document text
    • https://telewebejuta.weebly.com/uploads/1/3/1/6/131607630/8fe14b70.pdfIn PDF document text
    • https://pemejelusapi.weebly.com/uploads/1/3/1/3/131398576/tazaxobedaso.pdfIn PDF document text
    • http://zegiwire.sportsontheweb.net/working_principle_of_simple_carburetor.pdfIn PDF document text
    • http://funasowuto.getenjoyment.net/the_100_year_life_book_amazon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_8302c87ee45b47feb21635a15d914b97.pdf?index=trueIn PDF document text
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_ac94aed27f964f8db346c7ab35c07a08.pdf?index=trueIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_b20138072696463fa937e2cf8bfeeb9d.pdf?index=trueIn PDF document text
    • https://36d3fe4d-ce77-4ecd-ae21-04b42370c250.filesusr.com/ugd/871c54_cfb17735e76d485e98b80616b3e35dc4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/toyota_camry_hybrid_2013_maintenance_schedule.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/facebook_for_mac_laptop.pdfIn PDF document text
    • https://s3.amazonaws.com/waduzirader/galefofodemibiwudoresoto.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/36749810827.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/osrs_abyssal_demons_guide.pdfIn PDF document text
    • https://190d602c-e74a-4ea1-b1d2-d722d7947d0f.filesusr.com/ugd/1eddd4_06a57b3edf6445d4913be6df8d1465a0.pdf?index=trueIn PDF document text
    • https://52f9d6e5-2fd5-4906-a030-4d12f703b62a.filesusr.com/ugd/297ecd_d4a49047477e4eafb5112f3a438582d1.pdf?index=trueIn PDF document text
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_37f4a5f9b5b34f9c9d5dfffec03f5052.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86D 5252 bytes
SHA-256: 8b6be54e82be910b0ad639f0455c1684f713b588f79d30435458c89f03223ce9
font_01_sfnt_off0000ea5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5E 11924 bytes
SHA-256: 4e5c6113cad6b9f9a781b3607f1d88f9df9e14b5e45db45879b35770767fcfdd

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