Malicious PDF — malware analysis report

Static analysis result for SHA-256 e648aa911186f0fd…

MALICIOUS

PDF

75.8 KB Created: 2021-02-24 23:41:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: eb95529e03871c03ef0bd9c865d37e78 SHA-1: 49572c1f5330efb5403dce388b12074e911a4778 SHA-256: e648aa911186f0fd1ecf9b4060f1b2dc48a26f3d071af9a2ce54d4642ff3d551
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and Weebly-hosted PDFs, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external links suggests a potential for distributing further malicious content or engaging in SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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/123?utm_term=radio+sony+xplod+52wx4+no+funciona+los+botones PDF link annotation
    • https://jevokave.weebly.com/uploads/1/3/4/2/134266272/zubev.pdfIn PDF document text
    • https://muduzefob.weebly.com/uploads/1/3/4/0/134018051/c5776.pdfIn PDF document text
    • https://ziregorex.weebly.com/uploads/1/3/5/3/135351653/4322427.pdfIn PDF document text
    • http://medway24.com/police_reportz3c4e.pdfIn PDF document text
    • https://lefojokux.weebly.com/uploads/1/3/5/3/135399193/zuditilakawafe.pdfIn PDF document text
    • https://zogosozel.weebly.com/uploads/1/3/1/4/131406999/5969814.pdfIn PDF document text
    • https://dixaxotobaba.weebly.com/uploads/1/3/4/3/134377978/wefekipigiketijegu.pdfIn PDF document text
    • https://xubebedi.weebly.com/uploads/1/3/0/7/130776367/lupaxunikowu-vibanikajeruja-xepoxekarefuw-sepudu.pdfIn PDF document text
    • http://usblighter24.site/2nd_grade_books_cheap0x4am.pdfIn PDF document text
    • https://laropavo.weebly.com/uploads/1/3/4/5/134585926/9885045.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/jfhgFjb/aladdin_and_the_king_of_thieves_trailer_music.pdfIn PDF document text
    • http://idealica-itufficiale.website/asus_rp-ac68u_reset_to_factory_defaultc5i55.pdfIn PDF document text
    • https://zopamege.weebly.com/uploads/1/3/5/9/135966764/7002007.pdfIn PDF document text
    • https://cdn.sqhk.co/pevejotomoma/oXifKid/regewixetujugakoviwegogi.pdfIn PDF document text
    • https://libizegenumejav.weebly.com/uploads/1/3/0/7/130775388/rofovobefufovoj.pdfIn PDF document text
    • https://cdn.sqhk.co/tikalamin/5CDNgWk/seliwud.pdfIn PDF document text
    • https://cdn.sqhk.co/nobukomorur/jifwifw/catan_universe_steam_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/9472546307.pdfIn PDF document text
    • http://girofili.myartsonline.com/what_habitat_does_a_white_tiger_live_in.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_off0000e9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CF 5808 bytes
SHA-256: a26c504f0cdcc516f0e8065f07d614a2396fdb3b89da2c7ee9da0d4b0a04a6ec
font_01_sfnt_off0000fdde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDE 10464 bytes
SHA-256: 949d7e66db9fffc667a8baac690ae93464c70f2bd49f2ef9518a4a34b147dd45

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