Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c2752224bf6c194…

MALICIOUS

PDF

68.0 KB Created: 2020-11-24 12:40:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: d776144ca70949fc295558d8fd725263 SHA-1: ddf421c72db561553d13b176ec5457ca18eaf6f3 SHA-256: 8c2752224bf6c1942d559aed40833be6c24261279b53ae5224e4fee71b94ab1d
156 Risk Score

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 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://traffset.ru/strik?utm_term=festival+internacional+de+musica+e+d PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388060/normal_5fb81b8ecac63.pdfIn PDF document text
    • https://lurovexizapup.weebly.com/uploads/1/3/4/4/134402553/xolojegumomofedeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371267/normal_5f9010c686f9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369903/normal_5f88acdc61437.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403947/normal_5f982f8c7b2e0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fdeb20d-f218-405c-860a-d009325ddc8d/93200743854.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/683cd900-a358-4ea3-9df6-dc2d74bed502/80319631666.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/apricot_lane_farms_eggs.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/introduction_to_genetics_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60c9e347-621c-4843-88e9-22cbb93d2003/dogs_with_brown_noses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a15fa927-ed48-4f8d-9e2f-f6b042e12a57/formato_de_proyectos_productivos.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_off0000c833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC833 5100 bytes
SHA-256: e7193aba865eebbc24c900a2631bc7acd42cf8f0280f81bf7b1f4fa93cd8c1e0
font_01_sfnt_off0000d976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD976 13672 bytes
SHA-256: cbe7308c56002389df4b19800467ce6661ab0446e95f64679572538047adbca1