Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffdddc9c4ec1c76c…

MALICIOUS

PDF

76.7 KB Created: 2020-11-09 22:40:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: dea278389bcb62c6188e6ac6e167af28 SHA-1: de8e3bb2fd960a637060575a9347c2cabd96021e SHA-256: ffdddc9c4ec1c76c6293a5274b76783cfa9695bdc286abe200f84399f4e6c805
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/123?keyword=florida+freshwater+fish+identification+chart PDF link annotation
    • https://vefozifus.weebly.com/uploads/1/3/4/3/134382693/disuxow.pdfIn PDF document text
    • https://bezoduremudopez.weebly.com/uploads/1/3/1/4/131437412/dafozabusimitidodowi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394061/normal_5f914e8f68e08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5f8e51c5d4614.pdfIn PDF document text
    • https://dizugupixaxagoj.weebly.com/uploads/1/3/4/4/134440249/c9c03ef6c85116.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380707/normal_5f9131200d7f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417653/normal_5f959b508e124.pdfIn PDF document text
    • https://guratebiliwabop.weebly.com/uploads/1/3/2/6/132682790/puverukusi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421208/normal_5f97a5338bc75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421472/normal_5f9b090d282c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387241/normal_5f8d90ea6e280.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/7bc78613-261e-47a6-b769-404423023d3d/get_3_squares.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18c03e5a-d9c1-4096-8ee2-5add69fcc3d4/gerulipor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57395c7c-18d9-4bfa-b148-31cc35e6e9d8/rinotefibuwisakurug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cddc232-0b94-4f15-b59d-a9160bef3c59/jiboxezuxaguda.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/58214120212.pdfIn PDF document text
    • https://s3.amazonaws.com/texifaxepag/52404477700.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_off0000f199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF199 5156 bytes
SHA-256: a87e6c797ec4d975d647400f12b25d7a857a9db8c3a30e97d52ebd8108d925da
font_01_sfnt_off00010331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10331 9928 bytes
SHA-256: 9e43ff2c09cfe3c00a6932f12421836dff54fac4b8b85fb4c4ea8c9627732886

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