Malicious PDF — malware analysis report

Static analysis result for SHA-256 f695966ff0ad195d…

MALICIOUS

PDF

77.2 KB Created: 2021-02-18 12:06:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 15833fdc4e6b88e20135d77b76185912 SHA-1: b54d5b9e690e17c433cd5e654b2b4991dddedb0b SHA-256: f695966ff0ad195d5f37340b3d3fa713d84deabd78a35aa02ec17ae3737956cb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains keywords related to thermoelectric fridges, likely serving as a lure to direct users to malicious sites like https://jacksth.ru/strik.

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://jacksth.ru/strik?utm_term=how+does+a+thermoelectric+fridge+work PDF link annotation
    • https://cdn.sqhk.co/zubavagi/hZhaXhd/91817600282.pdfIn PDF document text
    • https://cdn.sqhk.co/dokiladigana/7girdh1/bibukiwarijariveforato.pdfIn PDF document text
    • http://magnetfix.store/similar_triangles_worksheetl03kw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486975/normal_5fdac908e948e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384628/normal_600685ff881ce.pdfIn PDF document text
    • https://cdn.sqhk.co/gixedomawa/icghgfA/fall_guys_ultimate_knockout_free_download_pc_crack.pdfIn PDF document text
    • https://cdn.sqhk.co/kagumuzom/owgehcT/the_hangover_2_end_credit_pictures.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389106/normal_5fef664222d3f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419847/normal_5fee46043866a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dixuzudes.epizy.com/27536613088.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/jepuz.pdfIn PDF document text
    • http://defizal.epizy.com/nopizagomojodopene.pdfIn PDF document text
    • http://sobikunukozi.rf.gd/farrington_lake_fishing_report.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/yesterday_piano_free_sheet_music.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_off0000ef22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF22 5552 bytes
SHA-256: bc77eee35928cad909cfe1d7f83623cb6eecaac97c7ae80538c11d4fa2e03451
font_01_sfnt_off000101ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EE 11284 bytes
SHA-256: f0a995dc17fa835c1f49eac2c4be75126a7e3708102cea26dda84430e73b3e61

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