Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f28f3d10d67e7de…

MALICIOUS

PDF

61.9 KB Created: 2021-02-06 09:19:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 936225baa4644dddccbfee38bd9c0dbf SHA-1: dbcd17d37f0f66d96dec57047e18df224b8d0132 SHA-256: 5f28f3d10d67e7de1800b30fb8fa595a936d6acafa2c8b297221a807f5e203c8
204 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=mamma+mia+logo+transparent PDF link annotation
    • http://center-about.com/jomidixzjo88.pdfIn PDF document text
    • https://cdn.sqhk.co/zesonixiv/ibhhigs/halloween_store_houston.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/5CUjjM2/best_forex_trading_strategies_that_work.pdfIn PDF document text
    • https://cdn.sqhk.co/jomonufo/dL6hegf/botavinemogoz.pdfIn PDF document text
    • https://cdn.sqhk.co/kizofapekeku/ojgcKFE/super_crafting_and_building_2020_apk.pdfIn PDF document text
    • http://hookup158.fun/tuck_everlasting_free69lee.pdfIn PDF document text
    • https://cdn.sqhk.co/seseniluvus/geB3gdy/97595532231.pdfIn PDF document text
    • http://henrysavbr.site/lubipalutapopugorusom1lkr.pdfIn PDF document text
    • https://dapodufez.weebly.com/uploads/1/3/3/9/133997146/65fe9ce.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/jaxesabi/nevetel.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/handover_document_template_resigning_employee_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/bingo_dauber_letter_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/sunujideg.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/bts_idol_full_hd_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/xiwajegipetemulaniwoxebi.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_off0000b743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB743 5144 bytes
SHA-256: a69982acb79b77b8cd7ca2f84f138b679b2658b378564299fcba6c687984dd5e
font_01_sfnt_off0000c8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B6 9988 bytes
SHA-256: 47030619a44816bd9fc23be0db2068cdde0ef515bccf97ae727cbd88d32e88fc

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