Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3cb68e871961636…

MALICIOUS

PDF

82.9 KB Created: 2021-04-04 11:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c5fece95cb361d0190937fe90fc8a341 SHA-1: 2e4eeacb42f1f752a1e861329cbf51d182266553 SHA-256: b3cb68e871961636750f5353f842c6eec73e230b2bfc8e6ed826dcc4f399dff3
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to Weebly and other free hosting services, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the presence of numerous external URIs and the PDF_SEO_LINK_FARM heuristic suggest the document's primary purpose is to redirect users to potentially malicious websites, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://dugedepap.ru/strik?utm_term=what+are+the+stages+of+human+evolution+in+their+proper+order PDF link annotation
    • https://tamusibexo.weebly.com/uploads/1/3/5/9/135966636/7225864.pdfIn PDF document text
    • https://pavenepono.weebly.com/uploads/1/3/1/3/131383439/6590041.pdfIn PDF document text
    • https://ravodesukifalav.weebly.com/uploads/1/3/1/1/131163780/nalalurizomot.pdfIn PDF document text
    • https://kefuluseze.weebly.com/uploads/1/3/1/3/131398598/fibinikiji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470543/normal_605b7a14f0164.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368235/normal_5fe91e971abdf.pdfIn PDF document text
    • https://bemetezebore.weebly.com/uploads/1/3/4/8/134882820/3e5751d35.pdfIn PDF document text
    • https://voranafirodibug.weebly.com/uploads/1/3/2/6/132696030/6002044.pdfIn PDF document text
    • https://likizosuzi.weebly.com/uploads/1/3/4/8/134886942/a3e313.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sakaburepagase/4039826133.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/book_antiqua_regular_font_free.pdfIn PDF document text
    • http://gezixerigalejeb.rf.gd/45778346931.pdfIn PDF document text
    • https://f9fc249e-2e6a-4908-9eb0-88005465a50d.filesusr.com/ugd/2530ee_2164f6d9ac8d47b99003c3ce7cf52163.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/an_acoustic_performance.pdfIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_f4d2b73a21724583bcc8d11e95c1cdcd.pdf?index=trueIn PDF document text
    • http://waniwuda.epizy.com/el_proceso_de_una_investigacin_cualitativa_es.pdfIn PDF document text
    • https://d0aee4dd-c5bf-4c29-adcf-3aa844f59ef3.filesusr.com/ugd/193d13_148bb9c7fd844acab3b9348c65a1212d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/hoover_windtunnel_pro_belt_replacement_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/logitech_mk360_vs_mk270.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F5 5412 bytes
SHA-256: 891d2614950315e29be0447766f04d38bc1533988d95e49a80b30069400a6685
font_01_sfnt_off00010b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B48 10948 bytes
SHA-256: bd69f6f00de39e67fc2bb692bf83feb1625b17aaacc0f2d5fb519e0122835da7
font_02_sfnt_off00013040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13040 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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