Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b41a614aec0d22…

MALICIOUS

PDF

75.3 KB Created: 2021-03-09 20:10:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ae8a905dde24935b00fd21442bfd6be5 SHA-1: f5d26973eedc49ffee1442ce02b4961a1e567161 SHA-256: b4b41a614aec0d22ea148669a51ceecd16bd7447b970e3474c0dfce6f08e0611
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO scam. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

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://nipisod.ru/award?keyword=english+bombastic+words+pdf PDF link annotation
    • http://e-sparks.ru/software_project_estimate_template_exceltwipb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463526/normal_6007027d11c62.pdfIn PDF document text
    • http://hydrofthol.space/live_streaming_news_cnnpp59k.pdfIn PDF document text
    • https://wimupajano.weebly.com/uploads/1/3/4/6/134682998/tanafi-webiw-duzetora-zorodagizanamuk.pdfIn PDF document text
    • https://cdn.sqhk.co/fakodozug/hUgjiDQ/movistar_plus_apple_tv_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365539/normal_5fcaa7633e4a2.pdfIn PDF document text
    • http://bestrongbyg.com/jitexudepolazogikutiyyu63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413225/normal_600bb126b4918.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496170/normal_6032a0738aa82.pdfIn PDF document text
    • https://wojaginobaxap.weebly.com/uploads/1/3/1/8/131857211/wilixetak-keliwujof-zibet-damatomojibinen.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406482/normal_5fcb54aa220f4.pdfIn PDF document text
    • http://health2health.online/database_systems_the_complete_book_solutions_manualnbhms.pdfIn PDF document text
    • https://cdn.sqhk.co/gebitasixa/gDWijsl/spacex_crew_dragon_launch_may_27.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://34ea5197-a9e9-4ba5-99bb-a7dd7aeba98b.filesusr.com/ugd/234f58_6481c40166a74f8a9b05044df21731cb.pdf?index=trueIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_2c17eecb31224eb4ae60412b62d1d591.pdf?index=trueIn PDF document text
    • https://6cda4dd4-8aac-43e7-8003-7c0eea9f7907.filesusr.com/ugd/34e26e_4cd827c665614b80b6641e7c0034a7eb.pdf?index=trueIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_5cfb8009a26b4d9490fe9f169e3f3dca.pdf?index=trueIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_73b78b7cff144734a2c58046c3eaec5b.pdf?index=trueIn PDF document text
    • https://1347de4c-4e54-429a-b84c-372e60bc5a2b.filesusr.com/ugd/6c98bc_e4dff9710e314272acf9d627d1333bf9.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_off0000e3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EA 5756 bytes
SHA-256: 9f494b0d406951ad2c693cc2c5cca88c87adf4dcf765db37816a20bf02f733b6
font_01_sfnt_off0000f76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76B 12232 bytes
SHA-256: 71be9db9650344c24f1e84fd44f9189cda22fcbe2f15bc54644c6323c6776334