Malicious PDF — malware analysis report

Static analysis result for SHA-256 f823aec1cb189a1a…

MALICIOUS

PDF

91.4 KB Created: 2021-04-02 15:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 251cd49a994c1d26c8447285a9e3ef1e SHA-1: 5e0dada2bb9467bc63308e10bd4f7f9dccbe80af SHA-256: f823aec1cb189a1a26a4a9e8979944a6b613d54f7839e6c329ed29640ac15cfe
136 Risk Score

Malware Insights

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

The PDF contains a heuristically identified random URL link and multiple embedded URLs, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_RANDOM_URL_LINK heuristics indicates the document is designed to redirect users to malicious content, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://soxebez.ru/award?keyword=babylon.+js+tutorial+pdf PDF link annotation
    • http://kozovuxe.22web.org/xojobunavumisorezuz.pdfIn PDF document text
    • http://habercigo.com/49807062500f4xtv.pdfIn PDF document text
    • http://pedrons.space/23479971920ghw19.pdfIn PDF document text
    • http://voiprormul.xyz/business_visitor_visa_australia_letterweyfd.pdfIn PDF document text
    • http://bopofefolinaw.22web.org/best_way_to_repair_a_washing_machine_drain_hose.pdfIn PDF document text
    • https://cdn.sqhk.co/xumesapaxoku/rsWnihc/endless_balls_3d_level_13.pdfIn PDF document text
    • http://sellamorem.com/wayne_dalton_torquemaster_1_manualosyop.pdfIn PDF document text
    • https://cdn.sqhk.co/zakoduba/bThchh5/bleacher_report_nba_celtics.pdfIn PDF document text
    • http://prolac.ru/merge_dragons_event_keys_201962vte.pdfIn PDF document text
    • https://cdn.sqhk.co/vamunidibu/jbihq6o/30066914229.pdfIn PDF document text
    • http://halfraire.xyz/canmat_bipolar_guidelines_2020cg1iu.pdfIn PDF document text
    • http://suluxigexu.22web.org/kindle_supported_file_formats.pdfIn PDF document text
    • http://privateguardingserviceagainstdanger.site/10897108194tvh4j.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nigabosepa.epizy.com/baudelocque_formation_sage_femme.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/93297896807.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/dealing_with_frustration_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/high_liner_foods_inc_annual_report.pdfIn PDF document text
    • http://xomezotesojopuv.epizy.com/69076859175.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/xuzufuwamaruxigepozeruf.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/zokilidumufevinuzilekuda.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_off000104b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B0 5432 bytes
SHA-256: 7f5be11bd3915ab6d5be7b4c68d393e0ab9759ee847bf805930d4c4145ae8422
font_01_sfnt_off00011741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11741 16200 bytes
SHA-256: ed3a28eefd3e835868c4dcb4f74592d927986e17495a029353a3b60c6aeb16d7
font_02_sfnt_off000149c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149C2 16516 bytes
SHA-256: da8fe2d704f9f48e7f55fd63c1285d9b553f117ba1786b24caa2f8846a07fd0b

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