Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c4c9b182a9a2c01…

MALICIOUS

PDF

77.6 KB Created: 2021-03-14 10:42:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bd3afe55ccc3d2296e5003a47bab44b4 SHA-1: 711cdfd2a510d858b01cdd02244ffbd9a78beec2 SHA-256: 5c4c9b182a9a2c01a04bbc964e73423da47cf02c9e45455e4dca345df82a1567
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, with one pointing to 'jacksth.ru', suggesting a phishing or malware distribution attempt. The PDF structure and embedded content, though heavily obfuscated, indicate an attempt to exploit users through a deceptive document, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=man+with+palsy+in+the+bible PDF link annotation
    • http://test123test.xyz/sukuxiwipikogobifulis98pau.pdfIn PDF document text
    • https://cdn.sqhk.co/wevexifimur/T13IGeK/diy_bookshelf_ideas_for_small_spaces.pdfIn PDF document text
    • https://cdn.sqhk.co/rikipago/5M4L1BR/43221110121.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369663/normal_602baa1d679d2.pdfIn PDF document text
    • https://cdn.sqhk.co/xavaxonad/AwjhjhO/gorujozadez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380691/normal_60327278b8c60.pdfIn PDF document text
    • http://julasopupep.iblogger.org/jubonoresitanovimu.pdfIn PDF document text
    • https://cdn.sqhk.co/bewiviki/giHjijc/riddles_with_answers_hard.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/fjihggf/talexosepafasewi.pdfIn PDF document text
    • http://fokefetebebinin.66ghz.com/factorio_guide_steam.pdfIn PDF document text
    • http://easterthjg.com/google_sheets_dependent_drop_down_listb5vuc.pdfIn PDF document text
    • http://dkblogin-de.com/72075330312626m0.pdfIn PDF document text
    • http://raisinsapp.club/684148866408wtdl.pdfIn PDF document text
    • https://cdn.sqhk.co/silakozafi/ZggpT4S/cerveza_amstel_ultra_informacion_nutricional.pdfIn PDF document text
    • http://latencfsrt.space/21076028365ozf9t.pdfIn PDF document text
    • https://cdn.sqhk.co/xugosovemi/flnhGgg/30600187199.pdfIn PDF document text
    • http://fesuzeroba.iblogger.org/banking_and_financial_terms_for_bank_exams.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fed083e1-1388-44c8-82c9-b619ee911f57/dunkin_donuts_veggie_power_breakfast_sandwich_calories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/305c2f87-a758-4ea3-9fd4-5a3659a48658/how_to_tell_the_age_of_a_burnham_boiler.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ead618e4-a07b-4c38-99a5-a02d6f4a4aab/zowixigege.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8b218f5-0725-4d46-8048-7eb5aa4fa05b/89507972779.pdfIn PDF document text
    • http://dulibifusarumo.rf.gd/que_es_una_ficha_hemerografica_y_sus_elementos.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_off0000f2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BB 5152 bytes
SHA-256: 940fdb85179b921775502068ab54ed285d55f69d25d00655e0bf9a4bf7b1da62
font_01_sfnt_off00010460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10460 10920 bytes
SHA-256: 304f691af4360da904f9074d51ebe68ee37dbab54f04b2e6667191f095797226

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