Malicious PDF — malware analysis report

Static analysis result for SHA-256 870023cba89a5c23…

MALICIOUS

PDF

84.3 KB Created: 2021-03-11 22:12:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b96bdfb2c3d3957d9aa6eb360ead683f SHA-1: 7fc8c4301c09023318e4c3a7c67673d57df4d81f SHA-256: 870023cba89a5c23fb8f4d0fa8e49270080fe17ac43d2adf9e89001817b73d84
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and PDF_SUSPICIOUS_LINK_LURE, indicating it contains numerous links to potentially malicious domains. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs, such as http://vittorguxx.site/boat_safety_equipment_requirements_canadahzaex.pdf and http://securitycheckingbrowservkcom.xyz/les_adjectifs_demonstratifs_en_anglais7cid7.pdf, are likely used to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://zajinet.ru/award?keyword=cristianismo+y+hecho+religioso+pdf
    • http://vittorguxx.site/boat_safety_equipment_requirements_canadahzaex.pdf
    • http://securitycheckingbrowservkcom.xyz/les_adjectifs_demonstratifs_en_anglais7cid7.pdf
    • https://fasepilof.weebly.com/uploads/1/3/1/1/131163931/wedujerajugirifuretu.pdf
    • https://xazojitov.weebly.com/uploads/1/3/1/4/131408465/aaeea4c5842.pdf
    • https://betebawaxudu.weebly.com/uploads/1/3/5/3/135388356/jexabudetoruvi-pixivi-panubi.pdf
    • http://familyit.info/cnc_programming_classesexeoh.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/juwofuxufijup/18756242737.pdf
    • https://uploads.strikinglycdn.com/files/05299b07-6a57-4b99-9c72-a924d4bb2c81/4_pics_one_word_level_239_answer.pdf
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_f7cf1cf77a71476bb20417d7c599de5f.pdf?index=true
    • https://s3.amazonaws.com/xixonu/70783121864.pdf
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_3cc0fd71ea274512a008c1555cc43bbb.pdf?index=true
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_ca47f9fa2ff34835b9a4d8ee113f3f14.pdf?index=true
    • https://s3.amazonaws.com/ninasivol/5070172635.pdf
    • https://s3.amazonaws.com/juzewojavomofew/narasimha_mantra.pdf
    • https://uploads.strikinglycdn.com/files/f0dae4c8-19e0-44ce-ac52-ed07bd1d33df/how_long_does_a_milwaukee_m18_5.0_battery_last.pdf
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_f434c5c30a404e7199dde646b7010449.pdf?index=true
    • https://s3.amazonaws.com/guwutivupudutu/kinilulofetedejowelaxo.pdf
    • https://uploads.strikinglycdn.com/files/97ca68d8-7406-4393-8c76-624e320a6dc6/93593350561.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_off00010857.bin
0e78071116043e5f5b13b3b284fc2007acb8f55fcf987d52764ca33dd79471e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10857 5576 bytes
font_01_sfnt_off00011b2a.bin
bbc56003ad20351eb6affca841bcaaede33f13725b5fe55afce35185dbd3e483		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2A 12240 bytes

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