Malicious PDF — malware analysis report

Static analysis result for SHA-256 679eedabf607d1e3…

MALICIOUS

PDF

74.7 KB Created: 2021-03-08 03:47:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9c0cbe30f160f0a2ac2f46e3d1f20f11 SHA-1: 143f1e3daef56b285d9c9b9b7da2887f876b7e25 SHA-256: 679eedabf607d1e3704bd43fea6798c4fe8d9ada86c3b29827dacb649acf26cd
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ClamAV signature and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://botokaw.ru/wix?keyword=fighting+games+unblocked+77', is likely part of this malicious infrastructure. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://botokaw.ru/wix?keyword=fighting+games+unblocked+77 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4505096/normal_5fe45bc5422e9.pdfIn PDF document text
    • https://mufosuxid.weebly.com/uploads/1/3/4/0/134040625/zudujavojixut_rejezolifu_vulekuwusowur.pdfIn PDF document text
    • https://favurujovonelod.weebly.com/uploads/1/3/4/4/134435517/9191297.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465539/normal_5fd932f3e3ca3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/67a7435f-a846-421f-a8ad-f6c28e146895/andre_hayworth_logan_king.pdfIn PDF document text
    • http://zekilope.rf.gd/riraxasapuwekizi.pdfIn PDF document text
    • http://fovafejixafixon.rf.gd/rgb_color_chart_for_printing.pdfIn PDF document text
    • https://c370dac7-4848-4fa0-a6df-94361299e8ba.filesusr.com/ugd/fa6303_8fd7d26586b443f0bc6f40f2debd7c07.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4191e625-58c5-40c9-a52a-1f3d240dfdb3/tropical_rainforest_biome_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3877d995-a569-411a-97f4-41771167086c/dagilovojoxakuziretogog.pdfIn PDF document text
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_6466a81b41d64c5dad8b16f0ac03d91d.pdf?index=trueIn PDF document text
    • https://931f52e6-cb68-4a93-8e02-54808d33f8b6.filesusr.com/ugd/6290de_5c3b6a1b6e0f485ba060fac1c76ef854.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5605ee34-1a03-41ea-bc79-b946388ef103/the_best_free_daws_for_music_production_2020.pdfIn PDF document text
    • https://878ee1be-828d-48b9-a24a-84283cf66a1c.filesusr.com/ugd/86936c_d8f010e6638f40349bac319d08ac4d0e.pdf?index=trueIn PDF document text
    • http://bejutamukedus.epizy.com/emulator_android_di_pc_yang_ringan.pdfIn PDF document text
    • http://nonibil.epizy.com/72064444533.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf551b10-1823-4c4a-8473-0b9221a519b0/zesux.pdfIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_92874ea48c9c41548eac77b5ca88ed6e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cd2686f-23a7-45cf-b169-990761d786b5/forizujigod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7540e680-192a-43f1-8480-cd744c2a16d3/cdigo_ascii_signo_de_admiracion_apertura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6a9cf46-2902-448e-b049-4b2eeefc28a0/juice_cleanse_recipes_for_fat_loss.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E8 5496 bytes
SHA-256: 1f5afadd06a25cbee5e60d12d2decf89ea9d55c71e2f2c48264e9c2b0680d34c
font_01_sfnt_off0000f980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF980 10688 bytes
SHA-256: bc6523baf93e6d27484e4bd6782474b9a950b4d8d90ad208c24ca7bb7eb82345