Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b28b2f90e1784ee…

MALICIOUS

PDF

70.5 KB Created: 2021-03-03 15:54:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 56c1ff6fbbbdd2af361d96ab448249ea SHA-1: 34d76c4e11b5b67d0ba7998e8bbe177e9bb3fee6 SHA-256: 8b28b2f90e1784ee998362997b85bdc77499a1121c7f8efcc716ffadf93beccb
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/strik?utm_term=hot+springs+grandee+owners+manual PDF link annotation
    • https://gimiduti.weebly.com/uploads/1/3/4/7/134711596/vilobenumoxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490739/normal_5fc717a24a3bc.pdfIn PDF document text
    • https://cdn.sqhk.co/rukububibon/jgQfjhb/best_carp_fishing_hook_size.pdfIn PDF document text
    • https://cdn.sqhk.co/bapulofuw/chiihEj/povaxebev.pdfIn PDF document text
    • http://comp-arenda.site/utorrent_pro_cracked_apk_onhaxw1mni.pdfIn PDF document text
    • http://idealslimitaly.site/sumijitowosepyibn3.pdfIn PDF document text
    • https://pixiguva.weebly.com/uploads/1/3/2/6/132681827/jatemozokul.pdfIn PDF document text
    • https://kabugumaka.weebly.com/uploads/1/3/6/0/136099465/metufumabifewapudovi.pdfIn PDF document text
    • https://cdn.sqhk.co/nezuxada/gijcjco/angelo_soccer_store.pdfIn PDF document text
    • http://montana-media.com/believe_finding_neverland_sheet_musicwvs4u.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384482/normal_5ff38c0b23cc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416934/normal_5fd2d721cbc51.pdfIn PDF document text
    • https://gesaseli.weebly.com/uploads/1/3/1/3/131379828/latekirebusitidude.pdfIn PDF document text
    • https://cdn.sqhk.co/sukonazukuv/gjhbBYO/39626760586.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/bopuxosavubare/92350205329.pdfIn PDF document text
    • https://s3.amazonaws.com/dafumuxitupav/16892199656.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/identifying_prepositions_quiz.pdfIn PDF document text
    • https://s3.amazonaws.com/dipafuxe/select_distinct_rows_from_excel_sheet.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_off0000d66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66A 5332 bytes
SHA-256: df9b1a007944f545761dfe1f883ac62fe5dd2d02ee23539340986b23a3cedbbc
font_01_sfnt_off0000e883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE883 10800 bytes
SHA-256: dbcca0cc86e71426d2c41980cbfa6b0e6bb89b772898e201f1ae4353a437b6d4