Malicious PDF — malware analysis report

Static analysis result for SHA-256 f056f6a161b1a805…

MALICIOUS

PDF

40.9 KB Created: 2020-11-05 22:17:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-15
MD5: 90fb35b98634115e437e439714963b69 SHA-1: 1d7b50aaf6bad5e255b854d042c075dce3460724 SHA-256: f056f6a161b1a805f39c20549a92d48186e313622379c7bb332af6cff6c5d368
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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/aws?keyword=cuisinart+ice+cream+maker+instructions+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373516/normal_5f9fb09dd22d7.pdfIn PDF document text
    • https://xukabasal.weebly.com/uploads/1/3/0/7/130776322/mubulig_bivedojiwimujuf_tixol_pinivobona.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414864/normal_5f9615d99b37c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379971/normal_5f9876314ad33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426697/normal_5fa45bc6db83a.pdfIn PDF document text
    • https://gomemetunugup.weebly.com/uploads/1/3/2/7/132712315/ponorusigutaxatod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378160/normal_5f8acbaa37482.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418747/normal_5f9c605e2dabe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372100/normal_5f971d29d5c4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370302/normal_5f9c6c1f988f1.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/fizufapu/74662677306.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/sonic_devastator_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c3dd2fa-c859-4fcb-bf1e-956538accb00/apush_chapter_1_study_guide.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_off00006265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6265 4916 bytes
SHA-256: 26af05479fae120bfb676737ea7c20485ff0445b0214cd940b3c19e394b569f3
font_01_sfnt_off00007302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7302 10496 bytes
SHA-256: 622780c4f0be1bb77b56bc0d9bfffe8b73cc303635b2c1bd51d4882eb86e1c75