Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef9a7272e5e471c0…

MALICIOUS

PDF

77.8 KB Created: 2021-03-31 20:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 529bcff639ce444a40fbdb74acb727bc SHA-1: 114e097631f40e20180b039493fe2bc4b7348207 SHA-256: ef9a7272e5e471c0366e084c8b7fb4525721939c3b8e1420a6c44e53f83c56a4
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to a suspicious domain, which is likely intended to deliver a malicious payload or redirect the user to a phishing site. The document body, though heavily obfuscated, contains keywords related to an app, suggesting a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/123?utm_term=bobble+keyboard+app++for+android PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4477910/normal_6006a5781d35c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486763/normal_605ba81f60961.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455198/normal_5fc667ba66d15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366398/normal_60187d6f72359.pdfIn PDF document text
    • https://cdn.sqhk.co/fivufotimad/hb4oChf/bhagavatam_stories_in_english.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403561/normal_6056e1df34c00.pdfIn PDF document text
    • http://kuvedodazi.22web.org/stein_on_writing.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/IJDhegj/fenekogesuregomumosur.pdfIn PDF document text
    • https://cdn.sqhk.co/zonakagud/hajbWii/best_free_albums_app.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/what_is_typography_graphic_design.pdfIn PDF document text
    • http://pujusojup.epizy.com/38982135796.pdfIn PDF document text
    • http://rotirokarovul.rf.gd/calendario_2020_costa_rica.pdfIn PDF document text
    • http://mosafipunot.epizy.com/binilupazu.pdfIn PDF document text
    • http://mowozikip.rf.gd/soxituxivadomivu.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/blame_it_on_the_boogie_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/nejopomiwafanemidow.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/nuwupi.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/56805971610.pdfIn PDF document text
    • http://ragasusivoreta.epizy.com/57019119652.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/16345427435.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD2 5212 bytes
SHA-256: c1b98dc6c9ed3eaf239c7cd57722eeefeaf230d935175112f250575a8bb6e3c9
font_01_sfnt_off0000eea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA5 11112 bytes
SHA-256: 30fdcd43ae1efc54c18f3148cb68543bf4e11de0ad9424dbc173cbc105a095e9
font_02_sfnt_off000114ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EA 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2

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