Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d393a3cad0f653…

MALICIOUS

PDF

76.0 KB Created: 2021-03-30 01:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 58f897394f9ddae3b3c1cc95ee1671cc SHA-1: a07db81b083654dd377ebf7d51c1cc46be914dd1 SHA-256: 41d393a3cad0f653ec7be8255ed7031f2418a96f466a87df8fe2e2dffd2f4a4a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicates maliciousness. The presence of embedded URLs suggests an attempt to redirect the user to a malicious site, likely for phishing or malware distribution, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xajibur.ru/strik?utm_term=linksys+ea7300+won%2527t+stop+blinking PDF link annotation
    • http://zekojotewakugag.mypressonline.com/zibimujixoto.pdfIn PDF document text
    • http://riniwovefaraw.22web.org/sanzaf_bursary_application_form_2020.pdfIn PDF document text
    • http://bonapimum.iblogger.org/my_boy_gba_emulator_apk_ios.pdfIn PDF document text
    • http://kifenefazujiz.iblogger.org/medieval_2_total_war_money_cheat_code.pdfIn PDF document text
    • http://lobutojumakix.22web.org/great_expectations_chapter_27.pdfIn PDF document text
    • http://poriwesebu.22web.org/arnold_palmer_hospital_case_study.pdfIn PDF document text
    • http://luxibenuguk.getenjoyment.net/dozij.pdfIn PDF document text
    • http://xakovakaxevasul.22web.org/kitubudinunamuba.pdfIn PDF document text
    • http://bapitosegapegi.mywebcommunity.org/soragowalexaforejuxi.pdfIn PDF document text
    • http://zizodoroluxonaf.sportsontheweb.net/reptile_and_amphibian_study_merit_badge_answers.pdfIn PDF document text
    • http://kerorakesona.22web.org/mac_cheat_sheet_for_pc_users.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nakevoja/black_chunky_block_platform_heels.pdfIn PDF document text
    • http://nulidofa.rf.gd/4818317348.pdfIn PDF document text
    • http://fogosapew.epizy.com/decree_crossword_puzzle_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/dazawojob/app_that_reads_and_answers_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/navratri_mata_bhajan_free.pdfIn PDF document text
    • http://fejedesa.epizy.com/base64_to_in_php.pdfIn PDF document text
    • http://lojabupabavize.onlinewebshop.net/edit_file_acrobat_pro_9.pdfIn PDF document text
    • http://lisuxuzilim.epizy.com/48593707714.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/semuzefasugiroxuzoxuw.pdfIn PDF document text
    • http://bemerolafun.epizy.com/casitas_lake_fishing_guide.pdfIn PDF document text
    • http://zutagisite.epizy.com/human_behaviour_at_workplace.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/gina_2018_asthma_guideline.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_off0000eb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3B 5648 bytes
SHA-256: d7e227e23da19a0d28cb2af389befda775b2e432445fe31fe710dd42a932cc00
font_01_sfnt_off0000febc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBC 10612 bytes
SHA-256: af114ef2e82cff60ef16c7487f8696cb9f1f353d6b20b18b1ead10cfc9fc8a69

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