Malicious PDF — malware analysis report

Static analysis result for SHA-256 defcfbd3fd493d40…

MALICIOUS

PDF

67.0 KB Created: 2020-11-19 22:44:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 7cd843adfda5f9b7b73e704889581e18 SHA-1: 3618d6b169c3e2414e1a9247178ded89c01648b2 SHA-256: defcfbd3fd493d40dcb079afe4e72bab5af985cffcdcd53f529c427130fcb023
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://traffset.ru/123?utm_term=pinarello+gan+rs+frameset PDF link annotation
    • https://rugaxiloved.weebly.com/uploads/1/3/4/3/134305568/6876262740b.pdfIn PDF document text
    • https://jijibaduwa.weebly.com/uploads/1/3/4/4/134495912/xemenilikizo-giwabinetejozeg-wazuripenerebam-jusejipan.pdfIn PDF document text
    • https://jasazifo.weebly.com/uploads/1/3/1/4/131437377/251352.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/datarofapakil/must_declare_a_named_package.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/zavebarebosogap.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/business_letterhead_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/76101328320.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/doduz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b393562-ec37-4ae3-8f4a-3db12624f3b8/2020_citrus_bowl_tickets.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_off0000c845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC845 5088 bytes
SHA-256: e7cfc459127e7dea1926129c4d6f51da6b00f5589481a3af78132f6f9db29da7
font_01_sfnt_off0000d97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97C 11228 bytes
SHA-256: 95a69739b455b4826d9a7c0c20d549cf4eb8aa59938b8723a8d30ae58f203d60