Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d37a96b308fba7e…

MALICIOUS

PDF

79.7 KB Created: 2021-03-25 00:44:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8145f1f20d71f9da495f1fe07c46345f SHA-1: 59168c3bb0ebfaf72c0b765c5840e9e6f2bf1a75 SHA-256: 0d37a96b308fba7e8d6176cdce249ab645169731361f0ceddf49ffc2f89a11f2
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs users to a suspicious domain, likely for phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to mathematical calculations, which is a common tactic for social engineering. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=how+to+find+volume+with+height+and+diameter
    • https://cdn-cms.f-static.net/uploads/4421339/normal_6036b488ccd50.pdf
    • https://static.s123-cdn-static.com/uploads/4373297/normal_6008fae1bba23.pdf
    • https://cdn-cms.f-static.net/uploads/4390660/normal_60407096a64af.pdf
    • https://static.s123-cdn-static.com/uploads/4387427/normal_600826e0c7f6b.pdf
    • https://static.s123-cdn-static.com/uploads/4471948/normal_5fdfbac88e182.pdf
    • https://cdn-cms.f-static.net/uploads/4387224/normal_60318c939f6c0.pdf
    • https://static.s123-cdn-static.com/uploads/4467950/normal_5fdd8a3bcd3e7.pdf
    • https://cdn-cms.f-static.net/uploads/4402250/normal_602fee2b5fc39.pdf
    • https://static.s123-cdn-static.com/uploads/4527164/normal_5fff6cebee9e0.pdf
    • https://cdn-cms.f-static.net/uploads/4462354/normal_6039a16ada27e.pdf
    • https://static.s123-cdn-static.com/uploads/4481662/normal_5fc7643fd3576.pdf
    • https://cdn.sqhk.co/gutifusuf/i4Nhfid/90466763498.pdf
    • https://cdn.sqhk.co/dutimapo/EggtibA/sivisezemavelelebedaginup.pdf
    • https://cdn.sqhk.co/piredonina/4zhhvgd/gojitivakadu.pdf
    • https://cdn.sqhk.co/taxeseta/iiaiajg/converse_bota_plataforma_imitacion.pdf
    • http://luvozoredola.iblogger.org/bluetooth_driver_for_android_tablet_apk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/19cf299e-a5a2-42cd-bc8e-9eb3852af517/73582365268.pdf
    • http://jajeridusepit.rf.gd/sql_stored_procedure_interview_questions_and_answers.pdf
    • https://uploads.strikinglycdn.com/files/4dc903e2-cf79-4d47-af65-412decec2984/pepidakis.pdf
    • http://tegumebedizeso.epizy.com/7220664835.pdf
    • http://pumifobivo.epizy.com/pudimu.pdf
    • https://uploads.strikinglycdn.com/files/61ee5a27-799d-469a-9da9-ddcb3d681914/how_do_you_tell_if_a_marble_is_valuable.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.

FilenameKindSourceSize
font_00_sfnt_off0000f630.bin
3aa298a54042668fdeaa424c5073b7d4f1c60a2cd4dca9af2f5bf80c4c295ea1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF630 5256 bytes
font_01_sfnt_off000107fc.bin
21c3e231c2ae0624fc00f475ed9506da51b84579e091aed3ef1e78d823c6f980
pdf-font-stream PDF embedded font (sfnt) at offset 0x107FC 11372 bytes