Malicious PDF — malware analysis report

Static analysis result for SHA-256 01a571ac7dae2ccb…

MALICIOUS

PDF

77.9 KB Created: 2021-04-13 18:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 32441e34a86b71e94488fe187c3f0989 SHA-1: 6336bc56e6fef036dcc97f4a15ad1e02be1a7f9c SHA-256: 01a571ac7dae2ccb8f72fd9f0e7635af3ed9dabdd987fb02687b7ee0a404907c
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs suggests an attempt to distribute further malicious content or phishing pages. No scripts were extracted, but the sheer volume of suspicious links points to a downloader or phishing lure.

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://xajibur.ru/strik?utm_term=how+to+turn+off+fossil+gen+4+watch PDF link annotation
    • http://soguged.22web.org/questions_and_answers_on_hybridization.pdfIn PDF document text
    • http://palamuduto.iblogger.org/togubepa.pdfIn PDF document text
    • https://gatamerat.weebly.com/uploads/1/3/4/0/134000446/murunarid.pdfIn PDF document text
    • http://digosige.mywebcommunity.org/27905181240.pdfIn PDF document text
    • https://cdn.sqhk.co/rezeribevi/m97CjcQ/95840670783.pdfIn PDF document text
    • http://sekuweb.iblogger.org/87888205123.pdfIn PDF document text
    • http://zedukibawubige.22web.org/somozinokaxorufitemipagi.pdfIn PDF document text
    • http://sozaxesugoj.mywebcommunity.org/afcat_ekt_syllabus_for_computer_science.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/ghyzsEI/mutukidezuw.pdfIn PDF document text
    • https://wujadadi.weebly.com/uploads/1/3/1/0/131070572/redejubolaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nulidofa.rf.gd/83951066591.pdfIn PDF document text
    • https://ee897e78-a157-4eb5-8a47-d615096087a2.filesusr.com/ugd/113e89_00226776f7ff4e8498c04f16fb254550.pdf?index=trueIn PDF document text
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_d3c4f06844cb43938631f4d6b792c5e1.pdf?index=trueIn PDF document text
    • http://xezemiguve.rf.gd/datubobulabonavarewola.pdfIn PDF document text
    • https://c18d9829-3add-4afa-bc87-35007fe3998a.filesusr.com/ugd/70c1ec_f08ca178bcde46a697f214fbb24a5b5e.pdf?index=trueIn PDF document text
    • https://6dd05bf8-a32e-4ce7-8057-9a1894012cff.filesusr.com/ugd/4ce960_0bfda55b31794c449d5518e7bb8e1eca.pdf?index=trueIn PDF document text
    • http://fasipubaweguguf.rf.gd/libros_de_castoriadis.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_off0000f396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF396 5284 bytes
SHA-256: a509786208dca093c314c9601217c1fa39c5b064db73c843efd8ee5c92114c9c
font_01_sfnt_off0001059e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059E 10784 bytes
SHA-256: bdd248a31278bccbc70ae2db2392f45ee1e7491f52d0700e837c5079708d0a6b

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