Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8aa30f85d74b0c…

MALICIOUS

PDF

77.2 KB Created: 2021-06-10 01:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 51e2f8116eff979e398d84e31daf34a2 SHA-1: 1535704afe35b59320d46728e7931b153b2bec2c SHA-256: 4b8aa30f85d74b0c881ce847fe551abe289d03c1532ce828d7b1597d4e241377
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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 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://crewmak.ru/pbw?utm_term=atomic+mass+finder PDF link annotation
    • https://javekekowunafot.weebly.com/uploads/1/3/5/3/135324960/sazunala-nofuxenekero-futokarazo.pdfIn PDF document text
    • https://gubilipolijig.weebly.com/uploads/1/3/4/7/134707964/747ee6.pdfIn PDF document text
    • https://juzemadarerux.weebly.com/uploads/1/3/1/4/131437885/98d1be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416930/normal_605cef5f119fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413012/normal_60399cc3679a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406514/normal_5ff97c72a863b.pdfIn PDF document text
    • https://balabirow.weebly.com/uploads/1/3/4/6/134690292/lenoka-guvirotaxedaba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jifesepapo.pbworks.com/f/driver_booster_7.4_free.pdfIn PDF document text
    • http://tojasakamu.pbworks.com/f/nisukogaxozarelumexapaboz.pdfIn PDF document text
    • http://xugatun.pbworks.com/w/file/fetch/144662685/52872026510.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92fdc1da-6c79-4e8b-aaf3-0872c7d07369/home_zone_security_led_light_wiring.pdfIn PDF document text
    • http://wasazejis.pbworks.com/w/file/fetch/144803619/adobe_photoshop_cs3_tutorials_in_english.pdfIn PDF document text
    • http://ziludezubeju.pbworks.com/w/file/fetch/144563238/76535617830.pdfIn PDF document text
    • http://jirofuwaso.pbworks.com/f/95626247868.pdfIn PDF document text
    • http://sozevupegufi.pbworks.com/f/lajokowomikuzibebirefob.pdfIn PDF document text
    • http://xuwedateredu.pbworks.com/f/11343244688.pdfIn PDF document text
    • http://garigor.pbworks.com/f/27109369688.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/426e9c35-28dd-421b-b843-462c8b0bf041/11404149164.pdfIn PDF document text
    • http://bezawagiga.pbworks.com/w/file/fetch/144669543/cnn_news_china_india_border.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_off0000edb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB8 5124 bytes
SHA-256: b7504d6444164340fc2daabae9ef1cdb94544f525a85cf96b39cde74eb5f96c4
font_01_sfnt_off0000ff0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0D 12356 bytes
SHA-256: 9b62d255d339ca444b8e24df1efbae2b845454b87a0a1872071004b65b6ab9b5

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