Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0d93dcc4fa3b22c…

MALICIOUS

PDF

82.7 KB Created: 2021-03-15 07:02:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bbbf8a8c4468071e591067a8fefdd3df SHA-1: ed14ac22e714feb12b5c49a3482f7c7422e5c277 SHA-256: f0d93dcc4fa3b22cf2878c8872746d5f13ebb45b1aa1e3af37ecd4047c46c6c2
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 or domains associated with SEO spam. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the structure and URL patterns suggest an attempt to lure users to potentially harmful content or phishing sites, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=does+tegrity+record+your+screen+reddit
    • https://dosasefezopalan.weebly.com/uploads/1/3/1/3/131398547/navujurebeze_lotibekow_volaken.pdf
    • https://nukubutanedun.weebly.com/uploads/1/3/5/3/135309192/datunusopivako.pdf
    • https://static.s123-cdn-static.com/uploads/4367631/normal_5ff50185ac650.pdf
    • https://sijokazodile.weebly.com/uploads/1/3/1/4/131454207/bisugafatifudu.pdf
    • https://sipobazi.weebly.com/uploads/1/3/4/4/134494275/zutakiwijijuxamaxo.pdf
    • https://static.s123-cdn-static.com/uploads/4486745/normal_5feb50ecabced.pdf
    • https://raxasowofano.weebly.com/uploads/1/3/2/6/132681821/xewaw-fezegaxo-nivivuvasaxix.pdf
    • https://cdn-cms.f-static.net/uploads/4456116/normal_5fd1e593c2442.pdf
    • https://lodarexuxune.weebly.com/uploads/1/3/4/3/134352809/jeguwililari-lubivesawido-ferema.pdf
    • http://rofodas.22web.org/apa_style_outline_format_example.pdf
    • https://tezefuvin.weebly.com/uploads/1/3/4/4/134496048/43788.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5f9aa58a-e7e9-4a20-8102-f4e4d3055d38/how_to_turn_off_nespresso_vertuoline_machine.pdf
    • http://nipinukajuxude.epizy.com/air_manager_free.pdf
    • http://saninov.epizy.com/5226503613.pdf
    • http://gituloropo.rf.gd/the_heart_blood_circulation_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/cf1d5129-ffb8-4c48-809b-99775fa48ac7/zuwidulukopo.pdf
    • https://uploads.strikinglycdn.com/files/376b2949-a552-4f66-864d-2f67119f3407/crank_ellen_hopkins_book_free_download.pdf
    • https://uploads.strikinglycdn.com/files/3f2fa3df-7326-4b9a-a201-fb62e6a01771/classify_antibiotics_on_their_mode_of_action.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001068a.bin
c38ede667898262ce1fe6f0e952d2f981ed19002c0026299898c05bd5e7eb693		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1068A 4968 bytes
font_01_sfnt_off00011793.bin
bc019691850bddeb5fc41cea492574507e7f319b817ed0e070bbe9b98ddf557b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11793 10548 bytes

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