Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c6da32944f4b4b…

MALICIOUS

PDF

80.0 KB Created: 2021-02-16 20:11:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 4740e3f4d32b415697d84a1c80aabaca SHA-1: 56076507027be36861e08e2d7b608766c95fdd5e SHA-256: f8c6da32944f4b4b07e07b3e12fd0116b56f74b0f1dedd2b5a9f38d5faeee3ed
126 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external URLs suggests an attempt to redirect users to potentially malicious content or phishing sites.

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://maypoin.ru/strik?utm_term=element+elefw328+remote+app PDF link annotation
    • https://wivapitawipalex.weebly.com/uploads/1/3/2/6/132682528/nepegodelaxebunuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487641/normal_5fe3dac06918d.pdfIn PDF document text
    • https://wisetigu.weebly.com/uploads/1/3/4/3/134357320/lonefexonoparikenoka.pdfIn PDF document text
    • https://muxupodijem.weebly.com/uploads/1/3/4/8/134885552/2851653.pdfIn PDF document text
    • https://garagagu.weebly.com/uploads/1/3/4/3/134364865/duzozopezawasosozoje.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwufupi/CljfFWP/fresh_carolina_reaper_peppers_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/retirijozi/igdahZa/director_project_management_jobs_nyc.pdfIn PDF document text
    • https://sapemeke.weebly.com/uploads/1/3/2/8/132814969/mebilefojuza.pdfIn PDF document text
    • http://rrrrkkkkk.space/36922864453pfihj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371266/normal_5ff522160fca8.pdfIn PDF document text
    • https://naxibozagut.weebly.com/uploads/1/3/4/5/134580084/xegipudomugapesobel.pdfIn PDF document text
    • http://trysoda.pro/zen_meditation_music_freek5ajp.pdfIn PDF document text
    • https://zegekeli.weebly.com/uploads/1/3/4/6/134616407/wikexajebijagumoz.pdfIn PDF document text
    • http://healsmall.space/comprehensive_reports_in_user_research_methodsm5928.pdfIn PDF document text
    • https://xikematevi.weebly.com/uploads/1/3/4/3/134392378/4897524.pdfIn PDF document text
    • https://fometixivoros.weebly.com/uploads/1/3/1/6/131637143/1828781.pdfIn PDF document text
    • http://dajumike.iblogger.org/aladdin_new_song.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vogidide.epizy.com/management_discussion_and_analysis_report_2016.pdfIn PDF document text
    • http://fosixijikalapi.epizy.com/injustice_gods_among_us_android_wiki.pdfIn PDF document text
    • http://bukarujinadir.epizy.com/after_2012_movie.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE392 5408 bytes
SHA-256: 84fef9c66af6779b74ae2e780922de843e46223876dbe051a31875aafbb0b1f1
font_01_sfnt_off0000f5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FE 11688 bytes
SHA-256: 278e74762e4256afa6eae07411f0e33d77f2cc514402e7efeaef716545a9a414
font_02_sfnt_off00011d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D87 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501