PDF malware analysis — malicious · efddc4b926645aea

MALICIOUS

PDF

84.0 KB Created: 2021-03-22 17:05:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 7126cb88181ed601feb272b2fac6c591 SHA-1: 60b378aa5da64b169fa31578f38f76aff27ad258 SHA-256: efddc4b926645aeabbc025f51ddad873b9af9460b51ab228bc256c3fc1bfa0b5

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URL pointing to a suspicious domain, likely intended to trick users into believing it contains IELTS test answers. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect users to a malicious site for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 4

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://leonvi.ru/123?utm_term=ielts+404+reading+test+1+answers
- http://ulekschool.online/zigomakunfhmi.pdf
- https://cdn-cms.f-static.net/uploads/4366989/normal_5fd331567b0ea.pdf
- http://razejeperijifop.22web.org/expanding_single_brackets_algebra_worksheet.pdf
- http://familyit.pro/bigadaretixaponarqskm.pdf
- https://cdn-cms.f-static.net/uploads/4443372/normal_60188d4ace167.pdf
- http://docita.fun/dr_jekyll_et_mr_hyde_film_1920o70ev.pdf
- http://tertov.xyz/safeway_starbucks_barista_job_descriptionj3ghx.pdf
- http://sonoxusa.iblogger.org/cbse_date_sheet_2020_class_10_download.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://uploads.strikinglycdn.com/files/bc495892-52f0-44cb-9616-65f9cd5c55af/my_samsung_tv_switches_on_and_off.pdf
- http://funedoja.epizy.com/79422552660.pdf
- https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_d8500227ad8347ee83a3ac9bfd605985.pdf?index=true
- https://uploads.strikinglycdn.com/files/be4ce36b-a801-4a65-9f24-b6ff1f59c05d/83688802348.pdf
- http://roxubimolileko.epizy.com/cdc_flu_vaccine_2020_english.pdf
- https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_69df7d1aae2647bc972d6ba8c6b2c4df.pdf?index=true
- http://zoxofitelovub.rf.gd/cancionero_catolico_con_acordes.pdf
- http://gibilumopujilot.epizy.com/wuzebipewekojutuzenajab.pdf
- http://vamudijikepefos.rf.gd/lufavori.pdf
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/xap/1.0/rights/
- http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00010353.bin` `36808fa31d3bfe7ff59e8e67dd64f4de4cf01ee30a9036aa4553842ca24d14bf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10353	5304 bytes
`font_01_sfnt_off00011584.bin` `754b6a59ad8a81f9767e0fa557680f65550f6f786a05d84fbeee8eee48500c70`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11584	14368 bytes

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