Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a11c8fae581e5e…

MALICIOUS

PDF

75.7 KB Created: 2021-04-16 14:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46fe230a025bb2f1e82eb259ebd03214 SHA-1: a5943bc428ec9f027fcb05974104615361912bd2 SHA-256: 37a11c8fae581e5e8131a4ad44c2336d17a3ccb3e5b4ce7a1ee298e04d9b7823
96 Risk Score

Malware Insights

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

The PDF contains a heuristic indicating an external URI, specifically 'https://ponafet.ru/strik?utm_term=how+to+make+tyson+chicken+nuggets+crispy'. This URL, combined with the ClamAV detection and ML classifier flagging, strongly suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the ClamAV detection point towards a malicious document, likely intended to trick users into visiting a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ponafet.ru/strik?utm_term=how+to+make+tyson+chicken+nuggets+crispy
    • http://dojemop.mywebcommunity.org/45448782680.pdf
    • http://fobexometoparu.iblogger.org/life_together_bonhoeffer_free.pdf
    • http://dowezujuzuzos.22web.org/58620528095.pdf
    • http://dokaxirugik.medianewsonline.com/amartya_sen_capabilities_approach.pdf
    • http://sazinoz.mypressonline.com/chuyn_i_t_sang_nh.pdf
    • http://fupemagis.mywebcommunity.org/los_nombres_de_dios_en_la_biblia_catolica.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zamemigojat/plastic_dust_sheets_asda.pdf
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_b1a24ac93a8a49b0b6ddeb582828b0af.pdf?index=true
    • https://s3.amazonaws.com/nazekisigiduz/sports_awards_2018.pdf
    • http://kufilabed.epizy.com/zojodokugakofiko.pdf
    • https://s3.amazonaws.com/jifedefujodu/gijoxiwesegotixolupavil.pdf
    • https://4590046d-f0a9-4171-b8a0-56ff8c1fe63c.filesusr.com/ugd/0bfb20_5b6985f1cfef4b72b747b9ae8c8877ea.pdf?index=true
    • https://s3.amazonaws.com/somamere/mobile_app_landing_page_template_free.pdf
    • https://uploads.strikinglycdn.com/files/9c142048-3e48-46d8-9db7-8f6a02bb2818/falapetokozizaxuluzofapas.pdf
    • https://s3.amazonaws.com/gogoxowiniza/synthesis_of_graphene_oxide_nanosheets_functionalized.pdf
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_982299bc20ad4e719e837b89c688016c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3fb15c4d-d569-4c96-88df-551d60c3ef0f/ramifizoferef.pdf
    • http://gekolutewubel.myartsonline.com/adenocarcinoma_pulmonar_tratamiento.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_off0000e4f8.bin
aeeba03096dad88f3a32f9477601528a56a35fa1c0fc4706d0949d23700c17bd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F8 5532 bytes
font_01_sfnt_off0000f7bc.bin
becb5e007205bb34879b0956d4fe4d9a9296a673cabca7debf4cb42e38b2137a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BC 12388 bytes