Malicious PDF — malware analysis report

Static analysis result for SHA-256 298b146a46567432…

MALICIOUS

PDF

73.1 KB Created: 2021-02-27 09:42:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 822126f86f682c8e9189ed682f52a850 SHA-1: a66daa83fcc5cbd2b3130467aa8c342f58d37aae SHA-256: 298b146a46567432586afe47247da983d3c007603e3a63f6158aa7e99579829c
276 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://vilenefex.ru/award?keyword=d+link+dir+601+password+reset PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481423/normal_600a21e4a633d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465263/normal_602839982835c.pdfIn PDF document text
    • https://cdn.sqhk.co/tudifemumopi/chbhbhf/zefipox.pdfIn PDF document text
    • http://xemizawufogutuf.scienceontheweb.net/vamumexilu.pdfIn PDF document text
    • https://bisebisa.weebly.com/uploads/1/3/1/4/131406118/266938.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481825/normal_600c689d34d21.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/varoximu/faxijesujejanewofe.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/playerunknown_s_battlegrounds_free_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/belesoviduzabib.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/vavivivizodibawawexa.pdfIn PDF document text
    • https://s3.amazonaws.com/wolawatin/al_quran_free_for_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/vevebewijinugimevub.pdfIn PDF document text
    • http://nopawalaxuwaw.onlinewebshop.net/64004798519.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/22568140772.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_off0000e0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DE 5456 bytes
SHA-256: 7ab6fb8cd7cdcd75c35987873e43e19b3df859081c02b9356b05e6856c1029eb
font_01_sfnt_off0000f38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38E 10684 bytes
SHA-256: 9de79195205ff57bee183c3793c72911058bb601fcd6ad0512cdeadb9ebeff1e

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