Malicious PDF — malware analysis report

Static analysis result for SHA-256 22897d3cdd0810c4…

MALICIOUS

PDF

67.3 KB Created: 2020-11-24 19:06:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9c5b570fb103ff58cb266248fa8144bf SHA-1: 94f6c5e1263ab9ed0d88db4a05f32873bb0218d9 SHA-256: 22897d3cdd0810c443821a7c62a8c5a5188db7d68080d48457218c75d271d7c2
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with one prominent URL pointing to a keto-related product. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or scamming purposes. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=vital+max+keto PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4497346/normal_5fb5ecf2102cf.pdfIn PDF document text
    • https://mivosubewo.weebly.com/uploads/1/3/1/4/131407796/9f1e467e1e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454432/normal_5fa60a26c9716.pdfIn PDF document text
    • https://vixeroniwemeful.weebly.com/uploads/1/3/0/7/130740086/zuzatiwi_kogeserud_nawabisafi_xoruvat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375199/normal_5f98d8924625d.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/16fcb69f-916d-4da6-8395-c8b31d1974bf/nenaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35e2a2e5-ea39-4214-8028-eaee249be030/swivel_chair_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aa8410d-2819-4045-8f5e-4bf3e1788753/lewosifagogokid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c478018-1f8a-4c78-a9a9-3527d8ca5d50/11783504625.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dc11402-260b-4812-a48f-8d857e02d781/95834120994.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc585e6c-45b1-46f7-814e-e13a81168cf4/42382111534.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_off0000cc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC14 4652 bytes
SHA-256: c24502a096c12f0270e7b9e593c8e291cbe449ee5865e1f2a7bcb5473777779a
font_01_sfnt_off0000dbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDE 10488 bytes
SHA-256: 209fee9e83790f10beea0e0d8d4f348cdb82d6b90f144a6adc333c775043e997

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