Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff0b8601ebe3ba7…

MALICIOUS

PDF

92.9 KB Created: 2020-11-11 18:12:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: f1a7cb1c00072e58cbd9fbd111065f30 SHA-1: d2ab826bb8902503e76825c2548a565cc83f2e8a SHA-256: bff0b8601ebe3ba7c1992bb698274ccf662aa240c6fd9471b034f260d781a5e2
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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=m%2526m+probability+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457847/normal_5fa282e632683.pdfIn PDF document text
    • https://luxotavazab.weebly.com/uploads/1/3/4/3/134349810/kilagasewino.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/034f98a3-fce1-4fbf-8725-b5a8da013cf6/jajamaforaza.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/mapquest_directions_and_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91c481aa-ee9e-4570-8120-507c00e8c988/wejofejidedixenabab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3a4e58e-b357-45f4-bd10-72bded245a94/giwoliloseruled.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc78c6ef-c479-4fd0-9b52-e999ca680ea3/wefiwaji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38966865-dd0f-4002-9aff-9ff8ed2dff0b/pol_237_purdue.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89d9049d-9498-4c36-b46c-6f6b60e01e1c/nutshell_ian_mcewan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8435d5ad-3905-42e4-b8bc-8ab9676add45/163842752.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94604c3d-c1bb-46cb-8c60-2422a5f5187c/zatobukagatuzizakijexuzoz.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19A 7688 bytes
SHA-256: 57138e4aee777707cdd6751289337f8830f78165f11ac358fdb8ca0ce00596b2
font_01_sfnt_off0000e56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56F 4160 bytes
SHA-256: 77b6376b59a9d368629888ce50b8588d8ae29044d19694f87e9cd78c0b86e73c
font_02_sfnt_off0000f362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF362 6228 bytes
SHA-256: 2d51e118b96e5ec2d61191261d439042a3fdf61d60da249a1538a0e865fe1a52
font_03_sfnt_off00010282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10282 1804 bytes
SHA-256: 5a8422a6293b04f3e1ca41a50f6506900bf15ceb53da561120e62b4023fa394f
font_04_sfnt_off00010b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B62 17000 bytes
SHA-256: a4f584d76800148113c8ac53e79fd8167bb186f2649487f818b74420b4b36f29
font_05_sfnt_off00013e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E47 16812 bytes
SHA-256: d6b39f295463ac7997b8b73034f94cb5a9a1d7e3e5941ca4790341100a78170d
font_06_sfnt_off00015622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15622 6184 bytes
SHA-256: 7f62afb12e622f642eb17f72d499ea07c6f12188a4aff0941b4d4fab845fea56

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