Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b6489b30ec7ff48…

MALICIOUS

PDF

84.8 KB Created: 2021-10-08 12:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9fe7d6ea384f021e226570d7b21b012e SHA-1: 7b330a0886d50fa99eb2c24fec3bd5c6c886984a SHA-256: 3b6489b30ec7ff48242e81b0cdb578e4a1141ffb8cfc8ef068dae1380d60be70
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains and exhibiting link farm characteristics, suggesting a phishing or malware distribution attempt. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 4

  • 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://allytemp.ru/uplcv?utm_term=dsm+axis+4+examples PDF link annotation
    • http://dga.gr/ILC/img/file/nukuwutajowemar.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/5496175319.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/bigozexuvinetimes.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/pukewupofa.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/3654554091.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/18655350489.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/juzajukodobokube.pdfIn PDF document text
    • https://kultmotor.hu/images/files/54749601948.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b65a94330---10172691853.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/lunafagulotij.pdfIn PDF document text
    • http://diepdoanhmetals.com/media/ftp/file/ritegow.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/fagapimaz.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/99302562222.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/zalevut.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/derur.pdfIn PDF document text
    • http://colonia-hausmeister.de/uploads/files/44824872600.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/30448177379.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/meronutejagi.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/87862500784.pdfIn PDF document text
    • http://webhoctot.com/app/webroot/uploads/files/gasut.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/muletikelefijidazugoti.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/12957655893.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4E 19892 bytes
SHA-256: 8eeaf51e1905290abea7a621cbe7cc13d125fdcd74ffc7e1f09f811d0dea44c1
font_02_sfnt_off00012f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F82 10172 bytes
SHA-256: 1c5e33c1372585a565e56641bd5ca733242c97a40931c710a2b555bda21a28df