Malicious PDF — malware analysis report

Static analysis result for SHA-256 211722f6f929001f…

MALICIOUS

PDF

81.4 KB Created: 2021-03-11 11:36:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e9688a68134e7a73c8d2f80c1dabe0c0 SHA-1: 510b7abeaecbbb93d4dd96475081b03806085bc0 SHA-256: 211722f6f929001f58cec62e950e70338370789912213f8e62fa654b5a006f0a
66 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of many external URIs suggests the document is designed to lead the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://xezojetit.ru/strik?utm_term=grade+or+standard+of+excellence+crossword+clue PDF link annotation
    • http://fotogodopuxet.iblogger.org/95696759777.pdfIn PDF document text
    • http://nituzovido.getenjoyment.net/employment_contract_sample.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410415/normal_602ea02f8b78c.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/how_to_connect_backbeat_fit_to_computer.pdfIn PDF document text
    • http://xibawolafubiz.getenjoyment.net/wamagiwuvigimofajadu.pdfIn PDF document text
    • http://lovumodezubudem.iblogger.org/lutewatap.pdfIn PDF document text
    • http://nesorus.mywebcommunity.org/how_long_is_a_one_pager.pdfIn PDF document text
    • http://sovolox.getenjoyment.net/diablo_3_necromancer_inarius_build_season_21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484356/normal_5fce5bb6afa14.pdfIn PDF document text
    • http://nitapida.mywebcommunity.org/room_rent_agreement_format_in_marathi.pdfIn PDF document text
    • http://dilawiputonu.mypressonline.com/73595270491.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a7176590-a44a-43b4-8b25-1171fb6190ac.filesusr.com/ugd/e6ccb8_bd1d5c64f15f4a0f81d77c61827efb2d.pdf?index=trueIn PDF document text
    • http://bigapenegig.atwebpages.com/56280904409.pdfIn PDF document text
    • http://zivositad.rf.gd/past_continuous_tense_exercises_perfect_english_grammar.pdfIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_d402c9b8f3fb4e8a8514d26e432a74d1.pdf?index=trueIn PDF document text
    • http://makakanow.onlinewebshop.net/femezexusi.pdfIn PDF document text
    • http://lofunadex.myartsonline.com/buzeleba.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_off0000ffeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEB 5204 bytes
SHA-256: cab2aae01aa7b52a8a418f838888bc75c0b2b7ccc742e3859909478844461291
font_01_sfnt_off000111c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C6 11300 bytes
SHA-256: 06424c2a163d7f34c08df2378a863fd5cdf2ac598c59cd0fbec1424d5999f48b

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