Malicious PDF — malware analysis report

Static analysis result for SHA-256 495f53e00aa62bad…

MALICIOUS

PDF

78.9 KB Created: 2021-03-20 12:03:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 310919527cb6832a373000f64d4bfae9 SHA-1: be70aeb5df86cafb519de81bb168037731a2a1ac SHA-256: 495f53e00aa62bad1477a55dac8bbe9c7a4eca657ea0a38abfd0fcf3cd7804bf
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms and phishing campaigns. The embedded URL and the heuristic firings for PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate a strong likelihood of malicious intent. The ML classifier and ClamAV detection further support this assessment, suggesting the PDF is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/award?keyword=android+tutorial+for+beginners+2020+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378379/normal_60373853ee491.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426060/normal_5fe29c402f0cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417123/normal_6018a486d9255.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367289/normal_604d1ccc5eec2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369522/normal_603ee50fbaf6b.pdfIn PDF document text
    • https://mazefitarunakur.weebly.com/uploads/1/3/1/4/131453858/ligiwefaviwuv_xebeku.pdfIn PDF document text
    • https://vimiwakemimug.weebly.com/uploads/1/3/1/6/131606159/diborix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474977/normal_6050590b545c2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e1ca4115-fb55-43f9-84f1-eaf814f8c83f.filesusr.com/ugd/18122d_9602c8436ea94e8fa98551aefb7accb2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/adobe_premiere_pro_cc_price_lifetime.pdfIn PDF document text
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_14e4a90d014f4793b7bd13094fb909ec.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fezenur/natevukulizakomazixazix.pdfIn PDF document text
    • https://c3f0ce02-b953-40d9-b94a-e38a054f9a35.filesusr.com/ugd/7afb62_007ea976dc5149d8bb47832d9a969798.pdf?index=trueIn PDF document text
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_0587104720d549e998003731e413006d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/coming_soon_website_template_html5_free.pdfIn PDF document text
    • https://f1c0478e-57b3-422a-b8eb-433964b677d2.filesusr.com/ugd/16c17d_637e12da741e46acb2db591ef6bfd44e.pdf?index=trueIn PDF document text
    • https://dca540c6-954d-4243-9f09-0921753db957.filesusr.com/ugd/974a4e_4e7e7647f81548f191934ca510e42cd3.pdf?index=trueIn PDF document text
    • https://041f977c-1598-48cb-b578-3d63f550c8ab.filesusr.com/ugd/524ae3_654097106b6240bd93d734eb362dc9ef.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_off0000f634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF634 5612 bytes
SHA-256: 11facb538a9aa79de3422f7bba9f2802587ace6b75c426748ca55b38330ac4e0
font_01_sfnt_off00010954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10954 10836 bytes
SHA-256: f7c8e3df21ea3090559858df9e515b58c9dce062a04210054b5bb91d1246b2ea

Open this report in the interactive analyzer, or submit your own file for analysis.