Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d72da5302fd98d1…

MALICIOUS

PDF

76.0 KB Created: 2021-02-22 03:01:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 7d36afd24ed9bbfe5d0a148bd54ab168 SHA-1: 65361cc37373eb76f26afa4584af62aa606e1405 SHA-256: 4d72da5302fd98d1e5804a54577be9f80fb3ed014858ae7d593c12ce6c3d3851
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The PDF contains a large number of external links, suggesting a link farm or phishing attempt. One of the extracted URLs, https://druttle.ru/strik?utm_term=how+to+scan+with+samsung+scx-4623f, is suspicious and likely part of the malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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/strik?utm_term=how+to+scan+with+samsung+scx-4623f PDF link annotation
    • http://janurikemodowu.iblogger.org/94990977922.pdfIn PDF document text
    • https://takazajabu.weebly.com/uploads/1/3/4/6/134610177/bexizitefelunofij.pdfIn PDF document text
    • http://zetomanebegox.iblogger.org/best_wordpress_hosting_sites_2019.pdfIn PDF document text
    • https://jexumaravoza.weebly.com/uploads/1/3/4/2/134265375/1bc2e.pdfIn PDF document text
    • https://jadojojipolukot.weebly.com/uploads/1/3/5/3/135337887/c6ec5e127cc.pdfIn PDF document text
    • https://xejapekedom.weebly.com/uploads/1/3/4/8/134864907/2307930.pdfIn PDF document text
    • https://muzezibabut.weebly.com/uploads/1/3/0/7/130739211/nuxesujidojap.pdfIn PDF document text
    • http://wimazosuwoxugij.66ghz.com/38483559163.pdfIn PDF document text
    • https://gitufigekuxos.weebly.com/uploads/1/3/4/6/134634758/db766d7c966.pdfIn PDF document text
    • https://mikudone.weebly.com/uploads/1/3/4/3/134370159/8988868.pdfIn PDF document text
    • https://dutosagow.weebly.com/uploads/1/3/0/7/130775111/darumemo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nelipofamarul.epizy.com/vcruntime140._dll_free_windows_8_64_bit.pdfIn PDF document text
    • http://kosejoviwo.epizy.com/39090219563.pdfIn PDF document text
    • http://wupafar.rf.gd/meal_plan_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/burkina_faso_visa_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/6142455230.pdfIn PDF document text
    • http://bejitepirisobi.epizy.com/backup_android_app_data_before_factory_reset.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/14172322565.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/44084907189.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/wifopixag.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/complaint_letter_to_hr_about_manager_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/nupak.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_off0000e6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F1 5860 bytes
SHA-256: 9e197433119fdacccfe760cb3203b40dea20a50c94dd03579e108052ee6df43c
font_01_sfnt_off0000faf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF0 11668 bytes
SHA-256: 6d071cbd0fc1720d1d41791e713fe2de14bb46c846e8d4c0d2749f3ebd992272

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