Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e5485a44601e6d5…

MALICIOUS

PDF

75.5 KB Created: 2021-04-04 15:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3cf0bc20fd3f23225c55efa2f3ecefc0 SHA-1: e8c24971f609b47adf3018ee5615c0d5f9478bab SHA-256: 3e5485a44601e6d5a830cfe2cd11b1cb45a20ba3dd1ef6632c9272e07b656607
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and external link farm heuristics point towards a malicious document designed to redirect users to potentially harmful content.

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://jacksth.ru/strik?utm_term=how+to+export+keynote+to+imovie+on+ipad PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4445331/normal_5fce8a8b30e76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407810/normal_5fd8b432d5fd8.pdfIn PDF document text
    • http://madewithsunshine.com/quorum_sensing_reporter_kittz4xa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488855/normal_600a15ddd27d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386849/normal_601fbbb51615c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445531/normal_60512fe3f361c.pdfIn PDF document text
    • http://copyright-infringement.business/626868833068g8xz.pdfIn PDF document text
    • https://tuzakipimuvujuv.weebly.com/uploads/1/3/0/8/130813756/2046521.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421201/normal_602339858de83.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453907/normal_6000fa144493f.pdfIn PDF document text
    • http://1xbet-registr.site/jenewezoresenujugtx4p.pdfIn PDF document text
    • https://taruzalo.weebly.com/uploads/1/3/5/3/135398133/jobinisivo.pdfIn PDF document text
    • http://sendgrid-de.com/110450399310w7n3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/falufusu/gusepo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98849d9f-4613-444c-8b9a-872f61a8016b/8-1_skills_practice_geometric_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/wanalovum/musujemipired.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ec3030d-bcf6-45cf-bfd5-d39718065222/bernina_1230_feet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb53a74f-f0b2-43c7-8094-0c1add3327a5/voxedifujulagepadojitulek.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/aruba_3400_controller_configuration_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/antivirus_programme_2019_test_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6d9a859-9c44-4171-99bd-65c95eb1d4fe/71353855920.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_off0000e840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE840 5244 bytes
SHA-256: 0efe5511cb96bf5b53c16cb7e13bdc63af18e717b6f241402d6237e11fbd4672
font_01_sfnt_off0000fa1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1C 11476 bytes
SHA-256: 20726737fc61490874c3c6dd9e590a210895ab04b4fe66b35ca638495adb6b0a

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