Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e624f0dfaa43219…

MALICIOUS

PDF

95.4 KB Created: 2020-12-18 04:20:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4ce0a93bd95a21ad56efa6562799d264 SHA-1: 516ee6053df1a05d5cf0b5d6d09c28a3daea265c SHA-256: 9e624f0dfaa432191418431dbb4af322ccbf7320aa11333738e5f21786ab2f28
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded content, though heavily obfuscated, suggests an attempt to redirect users to malicious sites.

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://trafffe.ru/123?utm_term=naissance+de+la+psychanalyse+freud+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375704/normal_5f927fe74d19d.pdfIn PDF document text
    • https://wobomiti.weebly.com/uploads/1/3/4/5/134501920/8263223.pdfIn PDF document text
    • https://xipunozelizu.weebly.com/uploads/1/3/1/3/131382486/450a4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402720/normal_5f96420d8ec02.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/4ba46075-2cf0-4669-88c0-5f14a67266a4/ribazixeziguramorexabukap.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2c9392bbd74065812d409/t/5fd15c089a9e5443ac6bca3d/1607556104901/tidubujozosaken.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46b5f62f-d78f-460b-a178-eed0ce23bb76/57428187123.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2886b848-7913-4768-a462-9b5dbe71983d/actividades_para_formacion_civica_y_etica_quinto_grado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f2a83a0-c417-419d-8b49-e5630ee24d5a/cricut_explore_air_2_mint_bundle_with_accessories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57dee510-5de2-4681-95ba-eb00c83721ec/limikukefekosinor.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc06b0d2e537a05ef0695ba/t/5fc0f721f81c9a2a0cc4e29a/1606481698100/xijetiw.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d57abd14ff0dd29c5223/t/5fc29d643c6ccf69f3b3ae1e/1606589796358/90054695843.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4e913f9866f3fd2edae8c/t/5fc84cfde101942bf76bcfe0/1606962430448/44564835891.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_off000134b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B0 5316 bytes
SHA-256: eff38fcba880690207b0f39c92f6e702ce82f96e6a433d384aef38a3f458a7b0
font_01_sfnt_off000146c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146C6 12856 bytes
SHA-256: 5e5ecc4f3dbb89f0d4173d10423c7ce6fa859781ef3ad91b8f2f761ca7fa8d34

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