Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1ed1527ea851ef…

MALICIOUS

PDF

78.4 KB Created: 2021-03-24 05:42:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9661217ca1286d3fad847372f5cd7799 SHA-1: 216b59087f7eb48c0028d637971bf12fc7f9b5de SHA-256: cd1ed1527ea851ef33e00f90725c394a3eb1d94d497eb2a1d59e54cd46ca414b
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, a technique often used for phishing or to host malicious payloads. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate malicious content. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document, likely a spearphishing attachment.

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 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://vilenefex.ru/strik?utm_term=list+of+gluten+free+foods+for+toddlers PDF link annotation
    • http://com-copyrighit.com/420321968853i9g9.pdfIn PDF document text
    • http://philonio.online/dishwasher_fixing_near_me94zcg.pdfIn PDF document text
    • http://bullbananavannaone.xyz/76162632399g4bqc.pdfIn PDF document text
    • http://raicen.com/the_young_persons_guide_to_the_orchestra_imslpfkcrh.pdfIn PDF document text
    • http://nazhivy.net/503169098410kmnb.pdfIn PDF document text
    • https://kajizifobizixa.weebly.com/uploads/1/3/3/9/133997117/9761148.pdfIn PDF document text
    • http://shtancircul.site/kimenegibebgvv3.pdfIn PDF document text
    • https://xuxijirabof.weebly.com/uploads/1/3/1/4/131406659/rizetejaluxe.pdfIn PDF document text
    • http://pajopoxofof.iblogger.org/how_many_sentences_should_be_in_a_conclusion_paragraph.pdfIn PDF document text
    • https://fegibaja.weebly.com/uploads/1/3/4/3/134305779/aa7f032936f8.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/gasodamuza/zakoza.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/96207883047.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/accounting_and_finance_interview_questions.pdfIn PDF document text
    • http://jegajumofi.rf.gd/26952069361.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/literizegukanijof.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/somulojisinujujezolosawap.pdfIn PDF document text
    • http://pepajefosub.epizy.com/kujugexukobirununipo.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/37290926540.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/42101990336.pdfIn PDF document text
    • https://s3.amazonaws.com/dogevazapiwediw/68111229681.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_off0000f725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF725 4808 bytes
SHA-256: 7330d43c45a344194a6cda47fd1a204ec29c9edb149c246248c481383db8ad5a
font_01_sfnt_off00010796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10796 10792 bytes
SHA-256: e4e562106b0792410ffe9c9276ab2b6bd253b81b1a9d7813647884aa707ce81d

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