Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b893e2ed444cd3a…

MALICIOUS

PDF

76.8 KB Created: 2021-04-25 04:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8f7e33440da0837ffc73a0119eee28de SHA-1: 9c388d3222c4db141a6a29ba141dbe9340f489eb SHA-256: 1b893e2ed444cd3a6a33689284cedd00183df1ebf112b79226c74f12518fb736
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many pointing to PDF files hosted on various domains, indicating a link farm designed to redirect users. One of the embedded links, https://kuzutuzo.ru/strik?utm_term=tecnica+de+aspiracion+de+secreciones+traqueostomia, suggests a potential phishing or content-luring attempt. The presence of embedded JavaScript, though not fully detailed, is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=tecnica+de+aspiracion+de+secreciones+traqueostomia PDF link annotation
    • https://cdn.sqhk.co/vumuwuxa/avgihNe/tozireralivik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417216/normal_60414d6c15fc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422894/normal_602d38e120aef.pdfIn PDF document text
    • https://cdn.sqhk.co/nejibija/yiiGNdQ/d_d_the_lost_spheres.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzuvazol/fhegcig/87378224338.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500200/normal_6029c90dbef39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463528/normal_60633282eda71.pdfIn PDF document text
    • https://cdn.sqhk.co/zozimevoket/hbhgiiW/80500578460.pdfIn PDF document text
    • https://cdn.sqhk.co/nikajovefer/iczgc3o/lego_rocket_racer_car.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/jd05Djb/snow_bros_2_mame_rom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481166/normal_60677ffd402ef.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/uhaPgjX/fire_alarm_testing_report_format.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385862/normal_5fde059fcf6a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392853/normal_5fdbac9610d0d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_3d78e7b7639b4a56b0b17b468d3acc06.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/gopirupavuxup.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/bilejokijanusadutawalosol.pdfIn PDF document text
    • https://504706c9-3a86-45eb-876a-6494ef133fff.filesusr.com/ugd/80c1db_08a7be3e74264d4b9ba9d831ae7c7568.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_off0000eccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCD 5264 bytes
SHA-256: 3e52cc6736ce15e8ac24bb682bdd727a245a5954a3a3058ae15da50c75228e4b
font_01_sfnt_off0000fe9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9B 11576 bytes
SHA-256: 00c01937f12f99a9e7b23b370fbc0406c76bf10ee1d9e15ca399fbe0e3819e23

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