Malicious PDF — malware analysis report

Static analysis result for SHA-256 561073b72a632f64…

MALICIOUS

PDF

93.5 KB Created: 2021-04-06 00:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2143dd9daf39e8e17ae3ffc5cea6f6f8 SHA-1: f6a479382fd087d7eec19ff31547fefaf2d05005 SHA-256: 561073b72a632f641f4857eec3da685c03e723e08e3ed1a72aba8eb10e77bfcc
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable hosting, and one primary malicious URL. The document's content, though heavily obfuscated, appears to be a lure related to "Alzheimer s vs dementia pdf". The presence of numerous links suggests a link farm or SEO poisoning tactic to drive traffic to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/award?keyword=alzheimer+s+vs+dementia+pdf PDF link annotation
    • https://cdn.sqhk.co/sinemajud/ghzjc3K/ibps_clerk_syllabus_2018-_19.pdfIn PDF document text
    • https://cdn.sqhk.co/tadeketoxab/jjahb6a/best_pill_reminder_app_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/tabawapizak/f5wcwge/transmission_shops_near_me_open.pdfIn PDF document text
    • https://cdn.sqhk.co/wodabakope/4XZ29mS/17089400953.pdfIn PDF document text
    • https://cdn.sqhk.co/pijovowifil/jjg4FbD/gorilla_city_vs_wakanda.pdfIn PDF document text
    • https://cdn.sqhk.co/jimevexir/jahhhj9/63391850088.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451762/normal_60126ac75298e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496818/normal_606b107eccb08.pdfIn PDF document text
    • https://cdn.sqhk.co/rufopunuk/5hbKhgh/taxi_driver_simulator_game_free_download_for_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6b5d12f1-3bbc-48af-9ddb-5430d2fe15e7.filesusr.com/ugd/3bf302_6ecf8835c0884ab3b812f03eedee3a16.pdf?index=trueIn PDF document text
    • https://bc13a564-db4d-4abe-bba9-081b1c4085ef.filesusr.com/ugd/d5ec75_ad66002af8ec477381aa19bbe61fe88e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/52cbdc87-b08a-443b-8767-d788e828633a/90953794429.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cee5ea87-0437-4585-8578-64a3d663ff79/48884841731.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/nitrogenous_compounds_combining_form.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/pelubuvak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4996746a-ac64-413c-aed5-dc0a3484cd9e/is_dreaming_good_sleep.pdfIn PDF document text
    • https://54a0e2cb-796f-4f80-9aaf-d11633176b06.filesusr.com/ugd/b0c554_bae814f49aae4292bb0f548d95592926.pdf?index=trueIn PDF document text
    • https://99b08629-27b2-41dd-83a1-938dc2ca35bd.filesusr.com/ugd/067ecb_2fe5d88d573a44639eb04ccd71024317.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bogijexu/49117387718.pdfIn PDF document text
    • https://413f70bc-0247-4a04-a3fc-eabb14e2b93f.filesusr.com/ugd/f18ee6_abf1b2fdad824c50b0244b86e777efcb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sabegokek/android_phone_under_7000_mi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fac82ad9-0c59-4c58-bec2-6e49cf6d6b9e/2019_civic_service_reset.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_off00013050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13050 5380 bytes
SHA-256: fd6319801dd00600c15dacc3e15b8c8e81fd0654b320c97dbe39c438f73e7400
font_01_sfnt_off0001427d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1427D 11164 bytes
SHA-256: 414269535bdf8faf596a2252d53dd6a275886c5bce4185bcc2ac478c39d3d39c