Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d2a8faec456d810…

MALICIOUS

PDF

75.8 KB Created: 2021-02-26 10:57:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bb2d6a50114eb187014f5beac1c1bed5 SHA-1: 940e6e77c5cf60800034b9926408cae36c879ef5 SHA-256: 9d2a8faec456d810bcd2bbcdc6b5031f09d3491f45dfee3b1c2be6b73f603430
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://mezovuduw.ru/123?utm_term=declaraci%25C3%25B3n+universal+de+los+derechos+humanos+del+hombre+y+del+ciudadano PDF link annotation
    • https://towodoruzaxigol.weebly.com/uploads/1/3/6/0/136050186/vuzut.pdfIn PDF document text
    • http://helpforteam.com/video_editor_music_cut_no_crop_apklz8rn.pdfIn PDF document text
    • https://binapesod.weebly.com/uploads/1/3/1/4/131438069/7503465.pdfIn PDF document text
    • https://kukitame.weebly.com/uploads/1/3/1/3/131379641/8353660.pdfIn PDF document text
    • https://nogexumojadug.weebly.com/uploads/1/3/4/2/134235638/zewofow.pdfIn PDF document text
    • https://nazesuku.weebly.com/uploads/1/3/1/3/131379506/7e6ed727c7a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466680/normal_5fecc4dacc17f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475989/normal_6014b7622c381.pdfIn PDF document text
    • https://gisijenoxumo.weebly.com/uploads/1/3/1/4/131437849/adacccfeb.pdfIn PDF document text
    • https://balolenitazir.weebly.com/uploads/1/3/1/0/131071159/7234608.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484610/normal_6010d824c3e9a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413975/normal_5ffd9df47efff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447877/normal_5fccf0055f460.pdfIn PDF document text
    • http://operationhomeplate.com/76592334048wqphg.pdfIn PDF document text
    • https://ganuzuvotaju.weebly.com/uploads/1/3/5/3/135304652/8c55e28d72f8e1.pdfIn PDF document text
    • https://tanibabinilez.weebly.com/uploads/1/3/4/0/134018029/sozimumon.pdfIn PDF document text
    • https://bugojexipu.weebly.com/uploads/1/3/1/3/131398417/0d405057813b5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE955 5616 bytes
SHA-256: 86d68b08841d191e2013c74556ecdebb15665962abb959568ec8f1a4e278b7c6
font_01_sfnt_off0000fc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0C 10472 bytes
SHA-256: f7eb9cf43e73e98051012b554c85f80d1cfa2c2345fb4322d85692144ab370a8

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