Malicious PDF — malware analysis report

Static analysis result for SHA-256 8630418d38a5759a…

MALICIOUS

PDF

62.1 KB Created: 2020-11-21 10:04:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: bcce40478c992be74afe3cee46b1fac5 SHA-1: c5a2458633a0ba536eaca1c166d0d23b335d01fd SHA-256: 8630418d38a5759a231b73c8116a641024e16b26a82a143214fe5b7f4f9dc104
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection mechanism. The presence of a critical heuristic firing for 'PDF_SEO_LINK_FARM' and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates malicious intent. The document body, though heavily obfuscated, contains keywords related to 'Minecraft' and 'texture pack', likely serving as a lure to entice users to click on the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffnew.ru/123?utm_term=minecraft+obsidian+armor+texture+pack PDF link annotation
    • https://boseveju.weebly.com/uploads/1/3/4/5/134595203/164fd081b6be.pdfIn PDF document text
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/8401583.pdfIn PDF document text
    • https://domuvajedoxu.weebly.com/uploads/1/3/4/8/134847007/3f87de2.pdfIn PDF document text
    • https://zolefixu.weebly.com/uploads/1/3/4/4/134432518/wivuzopigunalonabo.pdfIn PDF document text
    • https://sekojeti.weebly.com/uploads/1/3/4/5/134583019/640ef044b63c2af.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/zalomi/tom_robinson_case_tkam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fe0d1a6-71e3-44cb-8e9c-728aa9035628/fluid_mechanics_cengel_3rd_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7726eb25-0017-4402-9ecc-3f4b6763a7f1/35541619582.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/062dd1c2-2f19-46fe-b481-b792f17358ee/kazexaxuzidapi.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/riwonakuxapapepetaxafamo.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/heart_disease_research_paper.pdfIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/nuvikuvefuvizevomezesat.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_off0000b68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB68C 5544 bytes
SHA-256: a976f9a3fb6dc4701f75cef0e4de79bf51ff37ab43ec5ce4ab5f542b0b9b6220
font_01_sfnt_off0000c95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95D 10116 bytes
SHA-256: 0b92c35b017a354407ef1e17e2f0b3d08181e25aeb039c9fc555831d6070a478

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