Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cdbbf9cf397d6ba…

MALICIOUS

PDF

71.6 KB Created: 2020-11-22 08:39:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: e8aab593881030e5715c1cd3b43f5f8c SHA-1: f7701bfa58f657d37e42b3a89ad48186356433ac SHA-256: 6cdbbf9cf397d6ba8a9d86d3102e34bb2d28e22f38d5b544b0b269c311b70d88
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=dfs+vs+bfs+tree In PDF document text
    • https://gunewobeje.weebly.com/uploads/1/3/4/1/134109175/1769507.pdfIn PDF document text
    • https://panidulupeju.weebly.com/uploads/1/3/0/9/130969186/7076005.pdfIn PDF document text
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/bodobipoludef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca19c8e3-ac5e-4354-90c0-740e339fb1d0/lozerodulozivetedaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e74f3825-444d-48b2-bd0d-30a53421fee8/88372623145.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/034300e8-fe65-4bfe-b926-ac52152e6c0e/petonedote.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/8395026426.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d91839a-e54d-4559-b9ae-848f776d703a/lutixexajedenatekumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f41aa43-e72a-4c6d-8aea-196bd0d63804/86146386647.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51c89564-c5cf-4c09-94ae-fedbbf12eeb9/9900897922.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cf98dbf-24fe-4518-8464-98def0bf54a5/fegemisosike.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/19012561054.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/303da1e3-2bb0-4a5c-8f5f-31b87e4a27ba/brazzers_live_11.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_off0000debb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBB 4716 bytes
SHA-256: 1a5468aa68ac0549208025aedd49f07165ae7c5464f69723ed83dad0b9a44d25
font_01_sfnt_off0000eee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE6 10284 bytes
SHA-256: 95cc326a7988028eca81d1dbb6985ca90079d1c61c648d85a0dc83c5001cf824

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