Malicious PDF — malware analysis report

Static analysis result for SHA-256 2372bd115395aab4…

MALICIOUS

PDF

68.8 KB Created: 2021-04-03 00:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 403496727a1dcda381ac9d928f01156c SHA-1: 7a3b656e63c62c971aab0833da3587c797a1b1f1 SHA-256: 2372bd115395aab4cd7a10f571ff9d0d555bf46132a34ad40e0678677c2170b5
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, contains strings that suggest a lure related to a 'Trojan'. The presence of an external URI indicates an attempt to redirect the user to a malicious site, likely for further exploitation or credential harvesting.

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://nipisod.ru/award?keyword=caballo+de+troya+5+pdf
    • http://zuraribofib.22web.org/angular_4_download_file_from_web_api.pdf
    • https://cdn-cms.f-static.net/uploads/4409092/normal_6048fba632ac1.pdf
    • https://cdn.sqhk.co/buvaboda/Vij24gf/gexemafujodesidoko.pdf
    • https://cdn-cms.f-static.net/uploads/4392463/normal_6034374139cb4.pdf
    • https://cdn.sqhk.co/dutaxato/hh5Rigi/jowirudegokekep.pdf
    • http://novinove.iblogger.org/tawoxatasasewep.pdf
    • https://cdn.sqhk.co/ranemagesoga/ggchhC3/alarm_clock_you_can_download_music_to.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_7ff14c7ef06341f0bfa83c4eb64a424f.pdf?index=true
    • https://s3.amazonaws.com/rizezobabub/vesupajasewiro.pdf
    • http://kimugad.epizy.com/83041574577.pdf
    • http://kiluwemejibe.rf.gd/929741811.pdf
    • http://famefikapipu.epizy.com/dearly_beloved_cello_sheet_music.pdf
    • https://s3.amazonaws.com/lusabifef/zirumetixeket.pdf
    • http://gawekavadave.epizy.com/centrelink_disability_support_pension_medical_report_form.pdf
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_9365ea460d424d88ac687f64d3609dac.pdf?index=true
    • 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.

FilenameKindSourceSize
font_00_sfnt_off0000cdd1.bin
b641e4d499dd3dd9b427c0a91db02bc7c9a5e0e580c8759cb7e2f725b4b843d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD1 5128 bytes
font_01_sfnt_off0000df56.bin
e6d074e8971275cadfb75b5dcfcf24914d23bd2a3005d946e38a3449e1327d5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF56 11660 bytes

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