Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ec389fc03935d6…

MALICIOUS

PDF

76.8 KB Created: 2021-03-23 03:10:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 6fcce1b1f44249d85fa718de9dd3d868 SHA-1: 59722b7c9d74f400b1ccc4b2191724efe35ead2c SHA-256: b4ec389fc03935d6854c7a4f46f259eeefae757cee8ee2b8e5fba0c1eeee18aa
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The primary malicious URL identified is https://nipisod.ru/123?utm_term=perianal+abscess+treatment+pdf, which is likely used to redirect users to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://nipisod.ru/123?utm_term=perianal+abscess+treatment+pdf PDF link annotation
    • http://wolifote.getenjoyment.net/definition_of_stress_in_psychology.pdfIn PDF document text
    • https://cdn.sqhk.co/nixibaraje/iehbqTr/directv_sports_guide_soccer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422628/normal_602d7effacc17.pdfIn PDF document text
    • https://xekukagakodepa.weebly.com/uploads/1/3/3/9/133999272/2395616.pdfIn PDF document text
    • https://jikuvubavul.weebly.com/uploads/1/3/5/9/135964228/9197864.pdfIn PDF document text
    • http://lunagogafoxoj.sportsontheweb.net/pakijujanami.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496824/normal_60289b6b9f207.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463034/normal_602655cf48a5c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369524/normal_6005cb4f51d17.pdfIn PDF document text
    • https://cdn.sqhk.co/duditizonut/hi1y5gg/global_warming_causes_and_effects_slideshare.pdfIn PDF document text
    • https://jofenunamupil.weebly.com/uploads/1/3/4/3/134343358/nodinojozi.pdfIn PDF document text
    • https://lonunirixug.weebly.com/uploads/1/3/2/7/132710494/1a1260.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_3cd677d2656c4501b0b350f7b9723443.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vebisop/dososasagitefatarekit.pdfIn PDF document text
    • https://41fe7446-7195-45c8-906d-de5e784989f9.filesusr.com/ugd/e02969_d279561fda384144a20984d6fb9a27ae.pdf?index=trueIn PDF document text
    • http://lukafimagog.atwebpages.com/cloud_9_movie_disney_plus.pdfIn PDF document text
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_158a96d3194d422c94e1fb2481cb8f8e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/cable_tv_guide_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/mapopa.pdfIn PDF document text
    • https://9d349da1-218b-4b59-9e37-2a90cab56d40.filesusr.com/ugd/de9003_3fdea06c972246ed9b7926be4dd71efd.pdf?index=trueIn PDF document text
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_71b8d5db63254f2bbd6065de4cfb776d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/tapujamidoto.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_off0000ee5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5C 5444 bytes
SHA-256: a919797f327b7162637a80bcaff8a5ad9776c966558db852a7bc495e168a31fc
font_01_sfnt_off000100c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C0 10688 bytes
SHA-256: bd3bb484305218019c5dfdf182f66dcd41a8191b52f8c7e7d196a2a345c441e8