Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c5a359be8552bb…

MALICIOUS

PDF

74.7 KB Created: 2021-06-11 04:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e74813d939b40070e42800349cf27210 SHA-1: 5fa4ce912135603f6332f6025ddc41fce2aa90b5 SHA-256: 89c5a359be8552bb4c3c34e5085131e104eaa88109fb270a973acb02cd9e63bf
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://garglob.ru/pbw?utm_term=sasha+banks+theme+song+mp3 PDF link annotation
    • https://nibuduki.weebly.com/uploads/1/3/5/3/135314859/bisisubapadawi.pdfIn PDF document text
    • https://popoxalisasuper.weebly.com/uploads/1/3/0/7/130775362/zukewe_gijozumif_torito.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408481/normal_5fe965ec9a690.pdfIn PDF document text
    • https://zinebogexorebo.weebly.com/uploads/1/3/1/4/131437984/9810022.pdfIn PDF document text
    • https://sisolilunize.weebly.com/uploads/1/3/4/4/134466813/5d3aa790aae.pdfIn PDF document text
    • https://judewefa.weebly.com/uploads/1/3/4/6/134652715/6e9994e0a3d.pdfIn PDF document text
    • https://vilofezilo.weebly.com/uploads/1/3/0/7/130740065/3968786.pdfIn PDF document text
    • https://metiledozixav.weebly.com/uploads/1/3/1/1/131164016/vowabemidifesa.pdfIn PDF document text
    • https://bekekomigeb.weebly.com/uploads/1/3/7/5/137505653/xavulepapivagozali.pdfIn PDF document text
    • https://wepulawako.weebly.com/uploads/1/3/4/0/134096509/merizurexunu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382414/normal_603530330b9e0.pdfIn PDF document text
    • https://nigafabap.weebly.com/uploads/1/3/4/3/134377596/fubopimesibu_xoporameripijir_jizogimo_xekorisepedut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fadoposapat.pbworks.com/w/file/fetch/144572373/83096149102.pdfIn PDF document text
    • http://pagorevet.pbworks.com/f/o_ceticismo_da_f_download_gratis.pdfIn PDF document text
    • http://bepisoxu.pbworks.com/f/how_to_write_a_statement_of_purpose_letter_for_graduate_school.pdfIn PDF document text
    • http://fijovolumi.pbworks.com/f/64909955573.pdfIn PDF document text
    • http://welomobo.pbworks.com/f/refifot.pdfIn PDF document text
    • http://povivokovawi.pbworks.com/w/file/fetch/144893067/17530324302.pdfIn PDF document text
    • http://bemulopawed.pbworks.com/w/file/fetch/144442845/freeman_dyson_libros.pdfIn PDF document text
    • http://lagawiwefe.pbworks.com/w/file/fetch/144528486/nofikazevuvofisufaxel.pdfIn PDF document text
    • http://bazibenis.pbworks.com/f/network_diagram_template_documentation.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_off0000e50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50B 5576 bytes
SHA-256: 2c4e90443a3952ceb99a6118e2056775538215eb025e75923fa58da156e52b44
font_01_sfnt_off0000f7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DE 11028 bytes
SHA-256: c8709475e726b6e6d0c06274ad20cdfe8c48e2fdc5c5d97d0626284ec0004356

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