Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c195fdb739b2b96…

MALICIOUS

PDF

77.1 KB Created: 2021-02-25 16:19:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b04c366a8d994a4a3ac4f8c2c3e76b49 SHA-1: cdac048f639eace0519ab38409c6951b053460b4 SHA-256: 2c195fdb739b2b969eea95083985376f06ae318150f5c5d20688612034ff464c
66 Risk Score

Malware Insights

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

The PDF document contains embedded URLs that lead to various websites, one of which is flagged as malicious. The ML classifier strongly indicates maliciousness, and the document body suggests a lure related to search results. The presence of multiple external URIs and the link farm heuristic indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/wix?keyword=my+map+of+the+crusades+answers PDF link annotation
    • http://mafaregasinuviv.22web.org/los_mejores_cursos_de_ingls_online_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500897/normal_600aba19a9be6.pdfIn PDF document text
    • http://leledup.mypressonline.com/what_are_some_good_time_management_techniques.pdfIn PDF document text
    • http://puviwaxeraw.22web.org/24804529973.pdfIn PDF document text
    • http://nilitujawi.iblogger.org/change_battery_in_cateye_bike_computer.pdfIn PDF document text
    • http://gemubanabugawa.mypressonline.com/gepodidozulasugaf.pdfIn PDF document text
    • http://zimuzezu.22web.org/chilika_lake_bird_sanctuary_information.pdfIn PDF document text
    • http://bokovajet.22web.org/platform_toolset_v100_for_visual_studio_2015.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kavibajegis.onlinewebshop.net/aasl_standards_framework.pdfIn PDF document text
    • http://nejesezape.myartsonline.com/molodipikadirumulozok.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/15500683188.pdfIn PDF document text
    • http://kepofif.onlinewebshop.net/is_fl_studio_good_for_vocals.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/fuded.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/anandalok_pujabarshiki_2017.pdfIn PDF document text
    • http://newemepakirid.myartsonline.com/jaxivejofifoz.pdfIn PDF document text
    • http://luxizetugo.epizy.com/magafalajikovosazarugatu.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_off0000f020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF020 5560 bytes
SHA-256: 4eb161e41d70de0fa04210fc2ad915ce0378663004501b6eade3580d9cfb5ce4
font_01_sfnt_off00010302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10302 10860 bytes
SHA-256: df8d3f3e9dda028a15b7e774bc3b82c6cc0d8debe27af0e3b48f2bd96b17c96d

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