Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9539ef25b3cddbb…

MALICIOUS

PDF

74.9 KB Created: 2021-03-01 19:36:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c0e6570db604c277dacc7c591a001cee SHA-1: 16287d96b6013d45ffb74273f4df9712bc102a2f SHA-256: d9539ef25b3cddbbaca137604a2cca072e8049eeed6f924fa68e03b39c92edd4
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 0.9998

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 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://jumiwimov.ru/123?utm_term=sefer+raziel+hamalakh+free+pdf PDF link annotation
    • http://ligugiban.scienceontheweb.net/sony_str-dn850_test.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381098/normal_5fe3069136ba8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486994/normal_5fe7c0c4b5c92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368956/normal_5fecedf5e0005.pdfIn PDF document text
    • http://kalidejomepajo.scienceontheweb.net/american_government_and_politics_today_textbook.pdfIn PDF document text
    • http://rivepozepuxar.mywebcommunity.org/masterbuilt_30_bluetooth_electric_smoker_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367294/normal_60170094d7be9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368477/normal_5fda7fbeef671.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499972/normal_6014cfe15afcf.pdfIn PDF document text
    • http://kolagozisil.mywebcommunity.org/6259897875.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485589/normal_5fcdd657dc572.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420604/normal_60005a8e7952c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368237/normal_6014291f3946b.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/65899080486.pdfIn PDF document text
    • http://kikababono.mywebcommunity.org/95464436708.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_off0000e76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76A 5320 bytes
SHA-256: 4dee5d62be019a07de211b250ddd6d7fc4a47aff7e39c2c746283202c0cf9798
font_01_sfnt_off0000f95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95D 10856 bytes
SHA-256: 3642701d44df2acdae30e53ca90da5b946e2d27187982b1339114614d45f4d11

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