Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e95d6271d638db…

MALICIOUS

PDF

68.1 KB Created: 2020-11-11 07:24:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1b64a5074a23c4e3cb80de2bb4a8c8e5 SHA-1: b13bbc0513dca919e1729d3870ede3c3974b9b6e SHA-256: c9e95d6271d638db0611c21ca86ea0a3439aa232e632db074be08b9de0b3e4d6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9995

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?keyword=spiritual+principles+pdf PDF link annotation
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/5648329.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374188/normal_5f9314af5916a.pdfIn PDF document text
    • https://lugilalosu.weebly.com/uploads/1/3/4/3/134314137/8347246.pdfIn PDF document text
    • https://wegogutez.weebly.com/uploads/1/3/4/3/134310606/3368055.pdfIn PDF document text
    • https://fisalusul.weebly.com/uploads/1/3/4/3/134341538/dakatif.pdfIn PDF document text
    • https://sisodiwitamusoz.weebly.com/uploads/1/3/2/6/132681746/lavigubum-losijufelew.pdfIn PDF document text
    • https://vevinobe.weebly.com/uploads/1/3/4/4/134487659/midojexudepoma.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/419336ea-a112-4e27-a8ce-0675ec00a417/26814380059.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42e8b67f-61a9-47e2-8ea1-5f90e835545a/manual_de_documentacion_militar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e91c7f05-b1ec-4f13-9dff-4467509db7d7/wadowotenox.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_off0000cfee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEE 5252 bytes
SHA-256: a2e5422b99afa69df0778d18bc057363b5eb5ab6af6d72be8c7306ae23a71491
font_01_sfnt_off0000e1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D5 9924 bytes
SHA-256: 1b245b842502de89e1cfd2127f7acf71d2112aa254641a6d6c49c6d82e1d127d

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