Malicious PDF — malware analysis report

Static analysis result for SHA-256 5be86070c5c2488b…

MALICIOUS

PDF

69.6 KB Created: 2021-05-28 06:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7580a6fa3abf54b6721f2fea97235920 SHA-1: 3076b935986fa76f0ce8a6f1864ffce1dd08a59a SHA-256: 5be86070c5c2488b1f2c29f89e4ce9f43d05d728c75c7e15041213699c49f4cb
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or phishing operation. The primary URL, 'https://kuzutuzo.ru/123?utm_term=bang+bang+game+mod+apk', indicates a lure related to a game mod. The presence of PDF-specific heuristics and a high ML score confirms its malicious nature, likely serving as a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://kuzutuzo.ru/123?utm_term=bang+bang+game+mod+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459640/normal_6027a07d1b303.pdfIn PDF document text
    • https://vejegiraforid.weebly.com/uploads/1/3/4/3/134311029/vewufubakamalit.pdfIn PDF document text
    • https://femowoziso.weebly.com/uploads/1/3/1/3/131398515/ed6e4d7213f51.pdfIn PDF document text
    • https://minufufigazibur.weebly.com/uploads/1/3/4/5/134528603/mitujeromo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479236/normal_5fc7bb151c26a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497081/normal_6055006d93056.pdfIn PDF document text
    • https://voradirara.weebly.com/uploads/1/3/4/7/134744625/1bf95cc5b0a4f.pdfIn PDF document text
    • https://vobudofokivelux.weebly.com/uploads/1/3/4/5/134599261/ridezofo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471455/normal_6062e18488dda.pdfIn PDF document text
    • https://nulupuro.weebly.com/uploads/1/3/4/5/134596779/detogi_ziruvakasa_jumemaj.pdfIn PDF document text
    • https://nawiveburejofi.weebly.com/uploads/1/3/1/3/131381882/kuwugolapodugume.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/cc044796-76cb-490e-bab8-0715db29fb6f/xamosoroferesudonudow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c8e7fa0-5cd9-4fb0-b5ce-7830aeecc198/plantronics_backbeat_go_2_will_not_charge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f80dc9a-832e-4358-a63c-37e4e67decf1/how_to_improve_technical_writing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccda7a99-1c3e-4db0-8dea-c0ab1efe2825/what_are_fixed_and_variable_costs_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1b0b94a-fd98-4464-99e7-1abdcdee73db/drama_powerpoint_template_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7280c542-5143-4773-a0a2-d119e56db46d/digufudeburule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b772b0e3-b120-42c8-9e5a-51de72792f99/how_much_do_wendys_employees_make_an_hour.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/214a14fd-2ac4-47dc-947f-57df1d292c27/nombres_de_dios_en_diferentes_idiomas.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_off0000d31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31C 5224 bytes
SHA-256: 80cdc2dde400027c3f016896e8a759f6406c1a9f5d618487e6a0409993045aec
font_01_sfnt_off0000e4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D5 10332 bytes
SHA-256: 5e7fd2e0cd7ee6f94c9fadaab61aebe5dbcf11535bec225ff756152e45c180c4