Malicious PDF — malware analysis report

Static analysis result for SHA-256 21875c9a239c6b97…

MALICIOUS

PDF

82.3 KB Created: 2021-04-24 18:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4167692d529325d745b5972ab699d2c9 SHA-1: a4e0063987811b0ba71e04ded23dabd2880b5195 SHA-256: 21875c9a239c6b97b36a32ef585a88b5cc67842aba1d1d7b9eda80777a1607e7
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, pointing towards a phishing or malware distribution scheme. The embedded URL 'https://kuzutuzo.ru/strik?utm_term=ancient+greece+olympics+definition' is a primary indicator of the malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://kuzutuzo.ru/strik?utm_term=ancient+greece+olympics+definition PDF link annotation
    • http://vogeposekuxav.66ghz.com/yard_machine_snowblower_ignition_key.pdfIn PDF document text
    • http://fruit-ital.space/how_to_know_if_a_taylor_series_convergesq96i6.pdfIn PDF document text
    • http://umkatrade.ru/lubabajovh3qtm.pdfIn PDF document text
    • http://loveantravel.xyz/ps4_disc_tray_keeps_ejectingyoi38.pdfIn PDF document text
    • http://pedagaro.22web.org/aviation_technician_school_near_me.pdfIn PDF document text
    • http://mutodute.22web.org/zujomakub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kezosofudan.rf.gd/ashapoorna_devi_books.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/alcatel_one_touch_retro.pdfIn PDF document text
    • http://weloridotam.epizy.com/notogexutevawinepiraw.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/wawasafodifaw.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/gixuwisogot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c451fbc4-d269-4cfb-bac6-6fa80810b3ca/what_exercises_can_i_do_at_home_without_equipment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38268c2e-bda6-4b7b-b233-3e71f989c517/formato_de_mantenimiento_correctivo_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/865a011f-8c22-4565-af58-edf59d8ac23c/what_is_fervent_mean_in_the_bible.pdfIn PDF document text
    • https://7f1158f2-e44e-4cac-991a-806210d1dc3e.filesusr.com/ugd/e4a8e1_d91b024246e641568988bc6325514548.pdf?index=trueIn PDF document text
    • https://2dc0326d-ac60-47d8-bf46-f2dc9d334570.filesusr.com/ugd/21b4a7_43ec8a19dea7491a898b1252d36300a3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b511a5c3-0431-4753-b916-d1498db3e28e/rumexuguruvebuwebanopufo.pdfIn PDF document text
    • http://dotaxamis.epizy.com/java_apachebox.pdfIn PDF document text
    • http://mepivew.epizy.com/lejijebemeririb.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10324 5356 bytes
SHA-256: d45aeef722aaf461705543d3a818d85333cf834a27c2fc73b2d661b8b91e04a5
font_01_sfnt_off00011556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11556 10988 bytes
SHA-256: 73b69ff6d81d7498a50c9300a7f44243b127ce3e45897173db2856eaaffbf4b1

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