Malicious PDF — malware analysis report

Static analysis result for SHA-256 e18ba546e04ec3b9…

MALICIOUS

PDF

76.5 KB Created: 2021-03-21 04:32:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f97ef6e97009f89bd0f590560e9439f9 SHA-1: 0a78c6bb7a64c28dbafdada3971401de9a61334a SHA-256: e18ba546e04ec3b968cea40e55cc9a8d88c90ed83aaf65f21b57eff0a1d21f80
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, identified as a link farm. The primary purpose appears to be SEO manipulation or distributing malicious content via these numerous links. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest potential for exploitation or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/123?utm_term=bushnell+radar+gun+user+manual PDF link annotation
    • https://zegesunipatobas.weebly.com/uploads/1/3/1/3/131379774/tinipukegeze.pdfIn PDF document text
    • http://fomilurap.iblogger.org/varilofu.pdfIn PDF document text
    • https://cdn.sqhk.co/notenirikev/e4LSjhK/pocket_bully_weight_at_12_weeks.pdfIn PDF document text
    • https://cdn.sqhk.co/kiburonoxib/ijbjSVa/guxupotebukinoju.pdfIn PDF document text
    • https://vokavubibobudew.weebly.com/uploads/1/3/5/3/135316357/fuwogijavugaz-mumivesid-jijovuririkuji.pdfIn PDF document text
    • https://jetosiwer.weebly.com/uploads/1/3/4/7/134767378/pawag-mozupepujopedu.pdfIn PDF document text
    • https://gabusuve.weebly.com/uploads/1/3/5/2/135297202/801393.pdfIn PDF document text
    • https://pevapulef.weebly.com/uploads/1/3/5/9/135979240/48103.pdfIn PDF document text
    • https://rifodajawu.weebly.com/uploads/1/3/0/7/130739776/b7a0d48affb739e.pdfIn PDF document text
    • https://cdn.sqhk.co/sogupavetut/zQmidid/resignation_letter_uk_template.pdfIn PDF document text
    • https://kuvinonufero.weebly.com/uploads/1/3/4/3/134307364/6ca00f60e97b5.pdfIn PDF document text
    • https://sosakenokez.weebly.com/uploads/1/3/4/4/134445245/takalezeverajaker.pdfIn PDF document text
    • http://tejidirexe.mywebcommunity.org/diagnstico_da_anemia.pdfIn PDF document text
    • http://lelekelosutov.getenjoyment.net/where_do_chicks_come_from_book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://52aa71f3-9574-4e96-898b-bb16aa893b2c.filesusr.com/ugd/b13a71_09e4cb572d964a37b0700e05896a0b2f.pdf?index=trueIn PDF document text
    • http://rigatage.epizy.com/68767885298.pdfIn PDF document text
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_5bb1930d600c4090aa7a1b7a92bdbbfa.pdf?index=trueIn PDF document text
    • https://c4fca8c4-0f54-45c3-ae88-320069d86c16.filesusr.com/ugd/ac0d21_2270632ba065477fa980e71d9ad67778.pdf?index=trueIn PDF document text
    • http://renawexit.epizy.com/samsung_wf220anw_xaa_manual.pdfIn PDF document text
    • http://fededajuna.rf.gd/finidipume.pdfIn PDF document text
    • https://6bfd3344-23d3-4e03-ab7d-00c1c23eecf6.filesusr.com/ugd/be19e1_117f4949fe3141a890eb6f002dbf016c.pdf?index=trueIn 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_off0000ebdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDB 5288 bytes
SHA-256: 29d9d750d949f494779a87e5262e6b00588803b9d984eec5be735f6e61149a3f
font_01_sfnt_off0000fdaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAA 10984 bytes
SHA-256: 4f916d6d3d8d8eebfaf817bdf4690e46abaf60b4ac7f6fe833f4e8a9f708f905

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