Malicious PDF — malware analysis report

Static analysis result for SHA-256 24ba8bbabf01ba41…

MALICIOUS

PDF

85.8 KB Created: 2021-03-31 03:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a31ada79e0e3eb388269f57c2b68667a SHA-1: 61cdcbaaad4cec009b5ee44ee4b2ec708b7e7452 SHA-256: 24ba8bbabf01ba41d4ce2e43d66c3ab822f0966217907d1debbd7db2827d86d3
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malicious content delivery attempt. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://druttle.ru/award?keyword=history+of+ceylon+tea+pdf PDF link annotation
    • https://cdn.sqhk.co/vujuzira/fjiicGQ/rocket_race_car_4m.pdfIn PDF document text
    • http://reduslim-ordina.site/how_much_water_should_i_drink_a_day_testyw25x.pdfIn PDF document text
    • https://cdn.sqhk.co/vegedusovo/gSic3EZ/pixikafakupuzipelusukiseg.pdfIn PDF document text
    • https://resagivet.weebly.com/uploads/1/3/1/3/131383325/3004823.pdfIn PDF document text
    • https://cdn.sqhk.co/xagunetoxa/u3lxzhe/fake_gps_location_iphone_without_jailbreak_ios_11.pdfIn PDF document text
    • http://prognoz-football.club/71927931749od6fz.pdfIn PDF document text
    • https://lifitexuga.weebly.com/uploads/1/3/4/3/134356919/pazun_zukanotek.pdfIn PDF document text
    • http://ruzalonuxow.22web.org/48881796641.pdfIn PDF document text
    • http://akmurzina.com/armored_core_for_answer_openingc7hw1.pdfIn PDF document text
    • https://cdn.sqhk.co/pabilere/jbGT5hi/paper_bag_frog_puppet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_abe17a5edbe34bd69bb86c44084e44e0.pdf?index=trueIn PDF document text
    • https://92fa68c6-d088-48c5-94d9-776fe0504fc0.filesusr.com/ugd/5a053b_5ec7d03da3d047ba99c08072fca18993.pdf?index=trueIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_12bb50ce682c43e8b2001a637fe81d51.pdf?index=trueIn PDF document text
    • https://b3695a61-a5b7-457a-863f-99677d03e0cc.filesusr.com/ugd/f2a82d_1462e985bff3405b8947bc78545b1faf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f086acb-082f-42c5-9579-02d667d8156b/dr_jekyll_and_mr_hyde_summary_of_chapter_9.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46afc4c8-0ec5-4a70-8324-bedff0993031/hp_photosmart_printer_7510_power_cord.pdfIn PDF document text
    • https://e19809cf-df80-48c1-9975-8599b001ad7a.filesusr.com/ugd/062cdf_8eebc18b2bb04b7fb6243e6336664c63.pdf?index=trueIn PDF document text
    • http://wosolebaxuwutux.rf.gd/sukexo.pdfIn PDF document text
    • http://fawivemepogu.epizy.com/15779240315.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c29a00b4-1c0c-48c6-831d-ba06f8fe3b95/biwawoxosub.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D7 5000 bytes
SHA-256: cb27e8ae894126fbe1b987aa68f59e0e1acd1693f04edd15baa5ae911c4a63b9
font_01_sfnt_off000114e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E1 11596 bytes
SHA-256: a5c2458efb28d47f131d6da148eff33e4e060d13d375cb21d05d1dd566ada456
font_02_sfnt_off00013bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF3 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361