Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5ed4f08e42a053e…

MALICIOUS

PDF

81.6 KB Created: 2021-05-05 10:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b3028046d7eea010a637b200cafb139f SHA-1: 6b058b663a87010c5115a6adceaad39e85d8f0ea SHA-256: d5ed4f08e42a053ee8b68d695bbcf56a02098fb37aeb921c76a520471d3c4507
136 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 a machine learning classifier. It contains an embedded URI and an SEO redirector link pointing to 'https://ponafet.ru/strik?utm_term=do+you+read+multiple+books+at+once+reddit', which is indicative of a phishing lure. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://ponafet.ru/strik?utm_term=do+you+read+multiple+books+at+once+reddit PDF link annotation
    • http://antonioita.fun/nibumejil7ei.pdfIn PDF document text
    • http://termometr-medikal.site/elements_compounds_and_mixtures_poem_worksheet_answersbs4wy.pdfIn PDF document text
    • http://neriwor.medianewsonline.com/why_should_i_recycle_story.pdfIn PDF document text
    • https://cdn.sqhk.co/movijomo/jihhaEF/zesijejapel.pdfIn PDF document text
    • http://itdiscount.info/22351939397ny635.pdfIn PDF document text
    • https://cdn.sqhk.co/kixepijap/tjdnJMq/orc_slayer_trophy_guide_gauntlet.pdfIn PDF document text
    • http://exampl1214.com/63057122821q7as4.pdfIn PDF document text
    • http://cybety.xyz/can_you_replace_a_remote_control_for_a_tv84uiv.pdfIn PDF document text
    • http://italywow.info/juwebusoladaluisibn.pdfIn PDF document text
    • http://penafur.scienceontheweb.net/polaris_360_pool_cleaner_manual.pdfIn PDF document text
    • http://pedron.fun/korunubejjd2w9.pdfIn PDF document text
    • https://cdn.sqhk.co/xupumekejaxa/ghigj5s/digital_marketing_campaign_template.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/jafujasiwetid/whatsapp_auto_sender_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/dell_support_india_drivers_and.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/vawilizipenise.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/audi_q8_50_tdi_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/endnote_x7_full.pdfIn PDF document text
    • http://manosotidokef.myartsonline.com/52792932136.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/210207926.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/free_cursive_worksheet_maker.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_off00010202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10202 5524 bytes
SHA-256: 2b324c42265c477c38d6dc5403b6fa1db3e3355e689f9270b762d890d9428feb
font_01_sfnt_off000114bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BD 10540 bytes
SHA-256: 05819efdbf28e94963733568fe3d5f9020a629af4f8403bea5f87a5bb81662c5

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