Malicious PDF — malware analysis report

Static analysis result for SHA-256 4638dc44757316ef…

MALICIOUS

PDF

67.5 KB Created: 2021-02-27 12:52:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 818169057787aa5346e678d66ec2eabe SHA-1: 348aef796d8141aabee01044cd38e980bf8655f4 SHA-256: 4638dc44757316ef29be1e9eea410624850e6ecdd95dc9f90ff1ec22eaba5430
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://golowaki.ru/award?keyword=traductor+de+espa%25C3%25B1ol+a+ingles+en+pasado+simple PDF link annotation
    • https://napolapivu.weebly.com/uploads/1/3/5/3/135303388/jiterizofigol.pdfIn PDF document text
    • https://cdn.sqhk.co/bulegumu/lhhQp20/wibasugazidutizavowus.pdfIn PDF document text
    • http://kneeksi.ru/charlotte_joko_beck_dharma_talksirbhb.pdfIn PDF document text
    • http://losinglotterynumbers.com/tavidobufijojerazakumeridksgz.pdfIn PDF document text
    • https://kitedagipan.weebly.com/uploads/1/3/4/8/134892955/9199367.pdfIn PDF document text
    • https://xotozefubineru.weebly.com/uploads/1/3/4/5/134576546/161401.pdfIn PDF document text
    • http://markettop.pro/visiwafwuwe8.pdfIn PDF document text
    • http://gafujovinotu.22web.org/project_report_on_biometric_security_system.pdfIn PDF document text
    • https://vixodago.weebly.com/uploads/1/3/4/7/134716619/8079320.pdfIn PDF document text
    • https://cdn.sqhk.co/goronikel/ggjhagh/97628579069.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/vuterijoze/senior_dedication_page_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/febox.pdfIn PDF document text
    • http://pinaroz.rf.gd/taxixemekibovixefix.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/ambagan_2009.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/free_template_wordpress_bootstrap.pdfIn PDF document text
    • http://xufoturimixeb.epizy.com/bafefekafevasonepex.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/cello_instrumental_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/xabimusatunulabinefusito.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/html5_video_player_android.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/sony_home_theatre_amazon_answers.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_off0000c772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC772 5556 bytes
SHA-256: 661449ca17b54006dd9712bc172dcea78d566d4116fe9a9267f577d1d4c1d6d3
font_01_sfnt_off0000d9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F6 11088 bytes
SHA-256: 7c9f3bdd58144ab472d19b9373cd63c7a4c8bd8f6ac6749859c8dd7f38218257

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