Malicious PDF — malware analysis report

Static analysis result for SHA-256 91918292979bca85…

MALICIOUS

PDF

79.7 KB Created: 2021-09-13 10:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d9adab1689c36e4a784b69cdc7201c73 SHA-1: 6c31c6b84ff47688f3d5171b3b17d9889a1a40d1 SHA-256: 91918292979bca8554d321a1a92506d5307b8c6152e44242f8efe546af59aa82
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the suspicious nature of the URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=gta+rope+hero+mod+apk PDF link annotation
    • http://abnigakgdsg.friendship-match.com/upload/files/49068663079.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/61316813750.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/57921203719.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/kinikilajubi.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/51326336881.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/rilurakerug.pdfIn PDF document text
    • http://geotersrl.it/file/vesetewaxodixuro.pdfIn PDF document text
    • https://longhoang.vn/upload/files/bezusogidozezogopat.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/midaruvefewabo.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/penobujewawej.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d615a8de44---52952947892.pdfIn PDF document text
    • http://zamgph.com/uploads/file/051232392894.pdfIn PDF document text
    • http://lgassociates.in/uploads/34789015171.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/36220971122.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/zazenewagebasibutugoz.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a914ea96a---41021879546.pdfIn PDF document text
    • https://thehouseproduction.net/file/sepamofo.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/11396029366.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/fududoxevaluwedotivateja.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/fomidetirebibetabug.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210905174548.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_off0000d62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62A 16976 bytes
SHA-256: afe1b0f599eb1c8116c867d733f4b977f462fc214646cfe424ca7d3d23a07f59
font_01_sfnt_off0001022a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A41 10376 bytes
SHA-256: 14a3284fb5b9fcb482e9e8e7e988bdae7b6adaf46fb7a352a9ea37fb7422edf2

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