Malicious PDF — malware analysis report

Static analysis result for SHA-256 eda368990efcccb8…

MALICIOUS

PDF

69.5 KB Created: 2021-05-29 00:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7bfda59e6a98a38aaf199fd540524d89 SHA-1: 9d6a692d86c6bca20af7a00c1b348ac118c712ab SHA-256: eda368990efcccb86ac6f65acf7c13d96cf4cd910701fca8968338c347f078ca
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 0.9997

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://seumenha.ru/123?utm_term=adding+and+subtracting+decimals+worksheets+5th PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495860/normal_5fdaf53bad5fe.pdfIn PDF document text
    • https://velumosatowe.weebly.com/uploads/1/3/4/8/134883763/bizepanisiloza.pdfIn PDF document text
    • https://bazapefonufoteb.weebly.com/uploads/1/3/4/6/134637130/jotamizixezute-bawejituvet-bawevetoloja-pipifijovemebup.pdfIn PDF document text
    • https://xonarupitowij.weebly.com/uploads/1/3/4/6/134617661/kukiteju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406771/normal_601343f053bc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446633/normal_6050163ad607d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415291/normal_5fd9f6d5d5644.pdfIn PDF document text
    • https://xeninudi.weebly.com/uploads/1/3/3/9/133997188/3137799.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459464/normal_600622ad755f2.pdfIn PDF document text
    • https://metaxilam.weebly.com/uploads/1/3/4/7/134723413/vadib.pdfIn PDF document text
    • https://ligefunodimab.weebly.com/uploads/1/3/1/3/131398292/90a5dc1bfb675.pdfIn PDF document text
    • https://rimofemosi.weebly.com/uploads/1/3/4/3/134351632/3451968.pdfIn PDF document text
    • https://pawomasa.weebly.com/uploads/1/3/4/7/134737305/2323099.pdfIn PDF document text
    • https://tuzakalo.weebly.com/uploads/1/3/4/4/134492431/tukofinisup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421330/normal_5ff281cf6f917.pdfIn PDF document text
    • https://zefakibafiv.weebly.com/uploads/1/3/1/3/131383453/454956.pdfIn PDF document text
    • https://zadevadetolilug.weebly.com/uploads/1/3/5/3/135321342/xidumiposofoxi.pdfIn PDF document text
    • https://wajativakol.weebly.com/uploads/1/3/4/7/134749030/5731296.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/a7b4ef5d-16e7-4a81-9882-aaba3080e662/fafuruxev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76ec58a1-53cd-4e8e-a5da-c590345331a8/texidewu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/330b6715-eac6-44fe-ba31-b70377c88360/order_of_operations_with_decimals_and_fractions_worksheet.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_off0000d019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD019 5760 bytes
SHA-256: e7153f3e7c9a68bf2b4aa7d947bf50671c96e20e9fc4d6f3ca085b5cfdad790a
font_01_sfnt_off0000e3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A3 10196 bytes
SHA-256: d9e79ddfb58c423fad7cd069e8309d69d1e126dea565dca717e3abdf9a93df04

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