Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f9bfc03ab9aa5c6…

MALICIOUS

PDF

75.6 KB Created: 2021-02-26 01:53:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6fbcf4a1a7cf9da67debb90a4a6cc0eb SHA-1: 1e5d1cf8689dbce4e350dc133f68a9efe92babfa SHA-256: 3f9bfc03ab9aa5c6ca741e3d2339fba44ecc755fab3d8e2f6b931748c225b20d
186 Risk Score

Malware Insights

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

The PDF document contains numerous links to disposable domains and potentially malicious hosting sites, masquerading as search results for popular game-related terms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download pages. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it functions as a link farm designed to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/wix?keyword=super+mario+64+beta+rom+hack PDF link annotation
    • http://rowowesofazov.medianewsonline.com/33373187469.pdfIn PDF document text
    • https://cdn.sqhk.co/jupozaregu/hdSgdHw/29247637498.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/what_is_the_dominant_theme_of_the_yellow_wallpaper.pdfIn PDF document text
    • https://fulotagefopag.weebly.com/uploads/1/3/1/8/131857199/torikovuj_luzojijazokabo.pdfIn PDF document text
    • https://cdn.sqhk.co/bumogebiz/jTjgdX9/ligiderixixiparir.pdfIn PDF document text
    • https://tabekemaw.weebly.com/uploads/1/3/0/8/130874329/2390924.pdfIn PDF document text
    • https://mokowevabib.weebly.com/uploads/1/3/0/7/130739664/zovetav.pdfIn PDF document text
    • http://dizurexemubegog.mygamesonline.org/nfl_2015_schedule_excel_spreadsheet_2019_free.pdfIn PDF document text
    • https://cdn.sqhk.co/vasozaponem/hfbhajh/44358199968.pdfIn PDF document text
    • https://cdn.sqhk.co/xororofomed/8zhaaKQ/high_volume_instrumental_ringtones_free_download.pdfIn PDF document text
    • https://wegonugu.weebly.com/uploads/1/3/4/0/134040733/7951303.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dojonuta/electromagnetic_spectrum_worksheet_with_answers.pdfIn PDF document text
    • http://namepafubi.atwebpages.com/what_is_a_vw_service_plan.pdfIn PDF document text
    • http://gosaduzunake.myartsonline.com/besuvilixebuvikox.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/18939664517.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_off0000ea78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA78 5512 bytes
SHA-256: c9cd3e67330fe880f412aea729ad79812e933dc1169b968ececb0c6ed7afaafb
font_01_sfnt_off0000fd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0C 10736 bytes
SHA-256: be16e9f06730953123afaaf9e207bd6f94e8f528e4f128ec9dbb882e509c3ea6

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