Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9f9bddcdb487ea…

MALICIOUS

PDF

74.7 KB Created: 2021-02-27 11:00:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 2317c349661ba48b2ad3557d55936de1 SHA-1: 8a6c82f3b24768a41a184ae3011abe44f28eb336 SHA-256: aa9f9bddcdb487eabf6b2af69303885f00161405672084b14cfb7748ef021eab
256 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://xajibur.ru/wix?keyword=learning+theory+psychology PDF link annotation
    • https://fadurobudafeme.weebly.com/uploads/1/3/5/9/135959894/c20c9a4142.pdfIn PDF document text
    • http://euroshopme.site/pass_rate_pe_examwce9n.pdfIn PDF document text
    • http://mmamba.ru/child_psychotherapy_progress_notes_p103mq.pdfIn PDF document text
    • http://discovljzg.fun/street_soccer_flick_hack_apktrbh4.pdfIn PDF document text
    • https://cdn.sqhk.co/pefapalotux/gdJha8F/all_starfall_math_songs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366947/normal_5fe46ba2f05e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388405/normal_5ff4525816b1d.pdfIn PDF document text
    • https://cdn.sqhk.co/pejozujemu/djgt2gj/witazevunerurosorajiko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465565/normal_5fd2ceaa946db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379626/normal_5fcf11e29b938.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376612/normal_5fcaf6efc5b39.pdfIn PDF document text
    • http://sexedate69.site/wuxasakufila1hd2z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477155/normal_5ff6694154699.pdfIn PDF document text
    • https://cdn.sqhk.co/jimevexir/gZZiihi/29423616149.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/fasudikek/online_proforma_invoice_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/53702850545.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/67916256055.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/23936361193.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_off0000e86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86D 5236 bytes
SHA-256: a3bba2b8e61bb8bd05d532cba75b6e5c74d07b65c7c8c8def64f8a50409291e0
font_01_sfnt_off0000fa49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA49 10472 bytes
SHA-256: f93a040607fb57ea62915080ad8d5553b6b1384e151d87eed8ad5d9ce2729638

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