Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d359fc46ad3fcaa…

MALICIOUS

PDF

76.3 KB Created: 2021-03-20 19:41:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5c0a1940d2f46f0989dc184afbe61a3b SHA-1: 595c819391e2c06f78b39b4790af35224d6dbac1 SHA-256: 4d359fc46ad3fcaac04835b3a9db276902ad4bc3e258bd8b90f83fa006420f81
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 0.9998

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://midufefew.ru/123?utm_term=jonbenet+ramsey+documentary+viewing+guide PDF link annotation
    • http://fufejezonodim.mywebcommunity.org/juxivamutoloruzimoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369185/normal_600e597606f49.pdfIn PDF document text
    • https://bamukafigozoxin.weebly.com/uploads/1/3/4/8/134861202/4607117.pdfIn PDF document text
    • https://gamabisage.weebly.com/uploads/1/3/2/6/132681080/popadonorigiwi_vegofixe_sujeb_raradokinamoke.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421460/normal_5fec682288eca.pdfIn PDF document text
    • https://vixezikuf.weebly.com/uploads/1/3/1/3/131383943/nivapenibopajibemisi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485004/normal_5febb4b01a06b.pdfIn PDF document text
    • https://wijideziwu.weebly.com/uploads/1/3/2/3/132303229/kuximesil-denud-jevazelunogak.pdfIn PDF document text
    • https://zedowami.weebly.com/uploads/1/3/1/6/131637063/7b0e9ac694.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_7ee28b41b3574b7aa8babc277ed854cb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/38576417023.pdfIn PDF document text
    • https://d872ce2a-2baf-4032-ab86-ab75b2f66d52.filesusr.com/ugd/338562_dd0dc171aa04429db5c9155c44be0c04.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/05ccb09c-dcae-49de-a0d7-40b6b2086943/global_marketing_definition_wikipedia.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/demibeto.pdfIn PDF document text
    • https://s3.amazonaws.com/gatazeromij/answers_of_menschen_arbeitsbuch_a1._2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/247c3d0a-9310-481d-b400-f34f17192ae1/2_3_5_10_times_table_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/interscalene_block_ultrasound_guided.pdfIn PDF document text
    • http://duvodix.myartsonline.com/zusekegutusenixefuwagumut.pdfIn PDF document text
    • https://www.bustle.com/articles/181796-all-of-the-jonbenet-ramsey-documentaries-being-released-for-In 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_off0000ea46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA46 5608 bytes
SHA-256: 0c89e856a880a1f19d81d0b9c0723d1e77b337f2524c4066066adea928ac073d
font_01_sfnt_off0000fd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5A 11248 bytes
SHA-256: 1508fda59beea52e5d7df7cba2734179fa0b9beb05de6a5d982e503e8e3dabbb

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