Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c65b6595659db6…

MALICIOUS

PDF

87.3 KB Created: 2021-05-18 08:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3b425ca9b67bd1b1ba1539e83a15cbab SHA-1: 9db6c892cf252646161117d3e11f3c99da007e8a SHA-256: 90c65b6595659db6a21d7028bec52c56c722723b8f68b9b57afa9c2b2f136bae
126 Risk Score

Malware Insights

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

This PDF document was identified as malicious by an ML classifier. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO spam operation. The primary URL, 'https://soxebez.ru/strik?utm_term=how+to+pass+the+florida+algebra+1+eoc', indicates a lure related to passing an exam. No scripts were extracted, but the PDF structure itself facilitates redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://soxebez.ru/strik?utm_term=how+to+pass+the+florida+algebra+1+eoc PDF link annotation
    • https://zozilevijuni.weebly.com/uploads/1/3/1/3/131383476/noxitafovi.pdfIn PDF document text
    • https://samivixawudajan.weebly.com/uploads/1/3/4/6/134634686/22b34c083.pdfIn PDF document text
    • https://pixipemojawipe.weebly.com/uploads/1/3/4/4/134459682/lutisolubut.pdfIn PDF document text
    • https://mavezuwunokil.weebly.com/uploads/1/3/4/6/134627141/28a92368e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416811/normal_5fe155de4c19c.pdfIn PDF document text
    • https://xosipepimebat.weebly.com/uploads/1/3/2/6/132682768/ce3aa469d90a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480897/normal_6042c1f3a5599.pdfIn PDF document text
    • http://pumujavebedopa.iblogger.org/alphabet_phontique_franaise.pdfIn PDF document text
    • http://xejobaxonewaf.iblogger.org/87805520825.pdfIn PDF document text
    • https://kajibelewori.weebly.com/uploads/1/3/4/3/134307873/bapub-zexirudapejogid-kukak-dadexarig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366010/normal_60514296967db.pdfIn PDF document text
    • https://mepapezivodeno.weebly.com/uploads/1/3/0/9/130969154/lewezu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379038/normal_604b486010951.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443371/normal_6069d865207a6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/981a9afc-13fc-4762-939f-066473cfe7c2/kexuwezuvisisegeg.pdfIn PDF document text
    • http://vivusefodubelep.epizy.com/audiologist_job_description.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe700ea9-cd9d-48f6-a2a6-3efda4dcbbbc/69178043254.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d192c40-ed2a-4cf2-a72a-6b608e251e1e/how_to_change_load_order_in_loot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/646fd403-7733-4e24-8d95-3dfc6715a311/gawipijulatenozuje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc49e3a4-db7a-47c5-b7d9-28d35203f924/mcgraw_hill_connect_ebook_login.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d00c2148-bc92-4c9a-8439-54e6b37874bf/41666136138.pdfIn PDF document text
    • http://botasalipigu.epizy.com/nec_advanced_analytics_platform_solution_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2953812-22ab-44d3-afb1-82d49d675b3d/49004815105.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cacfc50c-3bb1-4908-aef3-17669033977a/attack_on_titan_season_3_episode_2_explained.pdfIn PDF document text
    • http://kavobomuvaweg.epizy.com/gofunux.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_off000111c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C5 5660 bytes
SHA-256: b107d95dd04d014d8d72e5a0a4dfe7ea180ff8b602dca7d0c42428b06cfd4df8
font_01_sfnt_off00012516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12516 12300 bytes
SHA-256: f2cca08fbdf6cdba6ea02c5fd3bbc1e1f7c9fc0526613d18c2ad80f9059feca1