Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ad0a18b7c319c73…

MALICIOUS

PDF

72.3 KB Created: 2021-02-04 15:04:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e75afb449c7456cf2ab176c2dd5ba8a8 SHA-1: eabaa9adffc727488e84811c47def75d4c7fb4fc SHA-256: 1ad0a18b7c319c737b3b4d331a4e9d0885476d8a98077638eb84d21c8476d4fa
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-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://crophysi.ru/aws?utm_term=3d+video+er+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376105/normal_600dd2aa648a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459629/normal_600a6a36df35a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501789/normal_600b9bbe1ffc4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382423/normal_5fc7b356c8c00.pdfIn PDF document text
    • https://cdn.sqhk.co/purorelaz/cDhigji/walkthrough_for_toca_life_world_town_center.pdfIn PDF document text
    • https://cdn.sqhk.co/wakivugex/dja4ggk/63408775277.pdfIn PDF document text
    • https://cdn.sqhk.co/fegadosijete/gjhfomH/masukibebosalalekunifusux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405930/normal_5ff2220f8c228.pdfIn PDF document text
    • https://zavitakeji.weebly.com/uploads/1/3/4/9/134904790/4939304.pdfIn PDF document text
    • https://zowadadevifu.weebly.com/uploads/1/3/4/5/134597758/kiwuzafidaginuxog.pdfIn PDF document text
    • http://biweekamnf.com/sewumaxelezizelivogalvlr1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446285/normal_5ff8232469c02.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451929/normal_6004b73cec12e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473938/normal_5fd078d349006.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391620/normal_5fcacdb9922d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450628/normal_601295266ee2b.pdfIn PDF document text
    • http://probmake12.xyz/aprender_frances_basico_gratis7udjh.pdfIn PDF document text
    • https://jufozawuvinuxak.weebly.com/uploads/1/3/5/3/135326647/f8836.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ce1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1F 4936 bytes
SHA-256: ba32ab7023245935aaf0cc9fd1bee150314f7b16fa88e2c8fef433fc7da58b44
font_01_sfnt_off0000df02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF02 20940 bytes
SHA-256: ed60aec41a9a7a17cc106b9742384adf3b290c679de15aab7ce1f011179cd765

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