Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc968c38b9b6435e…

MALICIOUS

PDF

72.6 KB Created: 2021-02-25 05:11:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: be981b4c365d8c94221d398ac315178d SHA-1: 7cb01a63c7c9753448a50eaa6680d72f13b14868 SHA-256: dc968c38b9b6435e27a3f90c0f4a016b5bf85f40a3a0923ff470d0d55226b0ab
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://jottigo.ru/strik?utm_term=what+is+canada%2527s+gdp+per+capita+2020 PDF link annotation
    • https://zoxiniguve.weebly.com/uploads/1/3/4/5/134584112/9e54d7b2f6167e.pdfIn PDF document text
    • http://copyrightsafetyhelps.com/povijijisokuxidhbxa9.pdfIn PDF document text
    • https://numeroluxovuz.weebly.com/uploads/1/3/4/7/134733954/4d0be.pdfIn PDF document text
    • http://sujabupinoda.scienceontheweb.net/ejemplos_de_dialogos.pdfIn PDF document text
    • https://vigenuwotefi.weebly.com/uploads/1/3/4/0/134012497/d5d755f1547c53.pdfIn PDF document text
    • http://shoop-fk.ru/rupinder_gandhi_2_sad_songs5nc5.pdfIn PDF document text
    • https://lubozukutiximik.weebly.com/uploads/1/3/4/4/134472848/6b058b71fc7a233.pdfIn PDF document text
    • http://menetufebev.22web.org/fubelizepopipa.pdfIn PDF document text
    • http://rafupofamurawaf.mygamesonline.org/gorajep.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/nokia_lumia_521_t_mobile_unlock_code_free.pdfIn PDF document text
    • http://momarivido.mypressonline.com/what_books_do_you_read_in_ap_english_language.pdfIn PDF document text
    • https://puziwurawube.weebly.com/uploads/1/3/1/8/131871408/6466059.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tefetuzuzip.myartsonline.com/how_to_sketch_for_beginners.pdfIn PDF document text
    • http://tuwutexo.onlinewebshop.net/97769346773.pdfIn PDF document text
    • http://zijipowatik.epizy.com/household_budget_templates_nz.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_off0000dd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2A 5624 bytes
SHA-256: 9d683919719207ead7dba2d16e1e22a61276be4e960af2e2a50617627368830a
font_01_sfnt_off0000f061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF061 10948 bytes
SHA-256: 0b0516af7c059d18034995f839c7b82a239348be43c8a75bb8656ee79ad353c1

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