Malicious PDF — malware analysis report

Static analysis result for SHA-256 5319b004d5b3686d…

MALICIOUS

PDF

76.3 KB Created: 2021-03-02 18:31:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 90fa4adb29214e3992b25766d9fc7302 SHA-1: 6f5628e480264085b07071383ae794a2560e5237 SHA-256: 5319b004d5b3686d06dd96eab2c8bd2402cb01c8e5b9026c5e6cf7d3fcd68d35
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO poisoning or phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a malicious intent to redirect users to potentially harmful sites. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

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://dugedepap.ru/123?utm_term=how+do+you+reset+a+tiger+rice+cooker PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383138/normal_5fff3b8a18e90.pdfIn PDF document text
    • https://gopikuximodel.weebly.com/uploads/1/3/1/3/131384340/1245805.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468819/normal_60069dda9b22c.pdfIn PDF document text
    • https://fivefijoxiwu.weebly.com/uploads/1/3/1/4/131453543/pejupuwavuzike.pdfIn PDF document text
    • https://vojawafi.weebly.com/uploads/1/3/1/6/131636668/nubijaw-zivibolubumemus-tenujelexavuse-misefa.pdfIn PDF document text
    • http://lubenoredeji.mypressonline.com/39872324303.pdfIn PDF document text
    • https://savatevadenu.weebly.com/uploads/1/3/1/4/131452836/8411686.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485946/normal_602c562549664.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/kelageketisefuv/95043510267.pdfIn PDF document text
    • http://kelovikaxovixu.epizy.com/12_dynamic_bible_study_methods_by_rick_warren.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/english_academic_word_list.pdfIn PDF document text
    • https://s3.amazonaws.com/xapota/zewovizunedaxojonumuruni.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/kunamabiwimifigupof.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/formative_assessment_tools_education.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/murray_lawn_mowers.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_off0000ed57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED57 5292 bytes
SHA-256: 6e6d71c661412443ce1c52333bf1156c76a8c0b1a7b0d44c9757ddc51fa34778
font_01_sfnt_off0000ff82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF82 10800 bytes
SHA-256: 45600113de62cf9ca44750f519565d92e4be25bcc511b4837936e66854652e9e

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