Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fb1e43962229d40…

MALICIOUS

PDF

77.4 KB Created: 2021-03-01 09:25:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: b5c18018bf5c39c7987d8cf41a316eb3 SHA-1: 7eb24791c5632a227a8bb8a32daae66c15116ba2 SHA-256: 9fb1e43962229d40514520ecc1170fd97e545a1ce268b01b2a9523dc8e2e586f
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/wb?keyword=introduction%20to%20computing%20systems%20from%20bits%20and%20gates%20to%20c%20and%20beyond%202nd%20edition%20pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485296/normal_600ec20197d31.pdfIn PDF document text
    • http://tafugegajotu.mygamesonline.org/dunagutaditapabal.pdfIn PDF document text
    • https://cdn.sqhk.co/wesuwajil/ujdPjfA/vixorovez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456398/normal_601f0fb4399de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391315/normal_5fc90add562ac.pdfIn PDF document text
    • https://cdn.sqhk.co/bamikalagov/jihbmjj/tubikorarulenuzilenur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527345/normal_5fd71928328da.pdfIn PDF document text
    • http://tuderoba.getenjoyment.net/mabariwoduwalevekisudewuz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448744/normal_600804d0cd0be.pdfIn PDF document text
    • http://manamuposa.getenjoyment.net/everstart_maxx_3_amp_6v_12v_automotive_battery_charger_bc3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366010/normal_600dcec7e2950.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501996/normal_5fcb1d68f2904.pdfIn PDF document text
    • https://tokuzowavabiv.weebly.com/uploads/1/3/4/8/134867887/jojulozinuteja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368230/normal_603281cb1ef6f.pdfIn PDF document text
    • https://cdn.sqhk.co/fasixazijaz/09hdhdP/19162614297.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ecd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD7 5756 bytes
SHA-256: c54888bf29bae92cdcb0ed935b23cc2b7ad206b55c0525d985292a75cb6f4025
font_01_sfnt_off0001005f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005F 11276 bytes
SHA-256: d40e8d230568d423afcfaee0912a9e2352cd383df0ffaf3a3ba8306bd7ae8d64

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