Malicious PDF — malware analysis report

Static analysis result for SHA-256 2295ba7cb2345ab7…

MALICIOUS

PDF

97.3 KB Created: 2021-04-07 17:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 65e49191d3bdf3825b054e3783352852 SHA-1: 24ae67f0a15cbb4b61f35838c9d3f080608055f1 SHA-256: 2295ba7cb2345ab7099ccd05c1033e8cecdca610350776ecd71aa10b01a63cc6
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF file flagged as malicious by ML classifiers and ClamAV. It contains a lure to install a browser extension or update, a common social engineering tactic. The embedded URL, https://yafferge.ru/123?utm_term=how+to+block+ads+on+twitch+android, is known to redirect to malicious infrastructure, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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 links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://yafferge.ru/123?utm_term=how+to+block+ads+on+twitch+android In PDF document text
    • https://cdn-cms.f-static.net/uploads/4467910/normal_601e400152648.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454277/normal_604d17325f582.pdfIn PDF document text
    • http://bigakeka.iblogger.org/computer_exam_date_rsmssb_answer_key.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501980/normal_5ff0990aa3829.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387050/normal_603c1886b0912.pdfIn PDF document text
    • http://sasegotib.medianewsonline.com/42869275774.pdfIn PDF document text
    • http://nakekizedexu.getenjoyment.net/31268184744.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379385/normal_606cf1a33645f.pdfIn PDF document text
    • http://jidudilubad.mygamesonline.org/90915009720.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://s3.amazonaws.com/rowubunak/54999494586.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/95147545017.pdfIn PDF document text
    • http://vavikanepib.rf.gd/85089880555.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/vepupinagitususuberen.pdfIn PDF document text
    • http://wozadubokurego.epizy.com/resume_handbill_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/41257210155.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/lewafenenibo.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/thanking_letter_format_for_donation.pdfIn PDF document text
    • http://bajofot.epizy.com/zudisaxoxub.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/41570872053.pdfIn PDF document text
    • http://rivebop.epizy.com/nomimizavuvexutikeruted.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/37101866038.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/71729419713.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/big_green_egg_table_plans_with_cooler.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/42150400220.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/adventure_game_app_android_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/fisobepiga.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/fall_foliage_report_arkansas_2019.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D97 4952 bytes
SHA-256: 0cfa0fca077bb5ed5ad58418f886d407b1eb48ffd40d8b4b0ebfa212943412d7
font_01_sfnt_off00011e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E53 2504 bytes
SHA-256: bda46a189ab5ca82e9a2dfbdd44eacc5857f8d08cd207523bdafa5b6a969d3e3
font_02_sfnt_off00012936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12936 11632 bytes
SHA-256: 0f3c0b18ca1c4f008f77a513d59a27424c7cbde013c1039f1f3c6e7005c396bb
font_03_sfnt_off00015142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15142 16904 bytes
SHA-256: 843ec7dc1bbd6ccbc964cdce6843e0278cc9cb1048285cfd99718a79dbc84da7
font_04_sfnt_off00016824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16824 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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