Malicious PDF — malware analysis report

Static analysis result for SHA-256 9633d6ba0e0abc34…

MALICIOUS

PDF

190.0 KB Created: 2021-02-22 21:41:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee4fb5770d537e390bed97b17c8836de SHA-1: e03c4ff960ede2f4e6144e4614b0bb88552d640a SHA-256: 9633d6ba0e0abc34f0dd29e7302d014c1955b13d3cb1224af279dbaef6d51397
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of an embedded URI pointing to 'jacksth.ru' with a query related to 'apk installer' suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wix?keyword=cwm+apk+installer
    • http://tisiner.iblogger.org/gezel.pdf
    • http://robot3.site/ligafagojijavivilonaga2jh6y.pdf
    • http://lomigizukifomor.22web.org/free_voip_call_software_for_pc.pdf
    • http://monubaz.iblogger.org/birthday_calendar_templates_excel.pdf
    • http://ogranifruit.space/rumakagasotagexogoleterztzu.pdf
    • http://pr-bux.online/xulilolgt86s.pdf
    • http://lowuwirakob.66ghz.com/29584190206.pdf
    • http://rodigevofu.iblogger.org/kuvefugoguperewoxame.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://subedawulowuwo.epizy.com/naming_acids_pogil_packet_answers.pdf
    • http://lokuvutifinulef.rf.gd/flexera_adminstudio_free.pdf
    • http://koraxirimaxodet.epizy.com/amleto_libro.pdf
    • http://tuzipegubeluwo.epizy.com/what_is_created_when_chemical_reactions_join_atoms_together_matter_bonds_isotopes_electrons.pdf
    • http://wufalejopasedor.epizy.com/dreamweaver_cs6_guide.pdf
    • http://fevoreselo.epizy.com/pekewijibidemesexi.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_off0002a438.bin
51df80e2c74120568fe746d2f9fcaed9db015b4bf2ebfde44a7a443c8b87c357		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2A438 5024 bytes
font_01_sfnt_off0002b547.bin
7ac87581e72633e9bfc28bc1a535f4b50ddb516706d932091cea20c235d496ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2B547 18160 bytes

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