Malicious PDF — malware analysis report

Static analysis result for SHA-256 66e91d78c25d0620…

MALICIOUS

PDF

40.7 KB Created: 2020-11-08 02:52:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 6f6297203d0c28261e626fe4a4ccdf34 SHA-1: b1fc0a424960c9b9317c88f3405b0038e205f674 SHA-256: 66e91d78c25d06201a55ef2f5561e4fb772da1dacefd7d176a03d71e689bec0b
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://trafffi.ru/aws?keyword=life+choice+keto+supplement PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386852/normal_5fa0e586d3441.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412391/normal_5fa40db69d9c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://jelosaw.files.wordpress.com/2020/11/88594697543.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55362da0-daa6-4165-87a1-ac882cb53b74/fopudezanegaxabi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e14ca37a-ae6c-4f5f-aff3-a249a760b203/the_wifes_lament.pdfIn PDF document text
    • https://sufuvuse.files.wordpress.com/2020/11/3074016501.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/42365496467.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bed68cc4-770f-456b-9d1a-3d8a78081420/lumetedalosafafuzujetufu.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/19382244100.pdfIn PDF document text
    • https://davametafa.files.wordpress.com/2020/11/th5_best_base.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61af9243-b479-474a-ac85-5dc61d595dee/kimafiwerolero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/873cf7dd-dd4a-4bcb-a14e-58123a8161b8/nosuvunajenun.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/fasamu.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_off00006176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6176 4956 bytes
SHA-256: 9f9f697bf0fcbc37d82583131037bc6a223d0b90743d4b228d2aca82f5b92f0e
font_01_sfnt_off0000723c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x723C 10564 bytes
SHA-256: a85f8f241d1653ddada10a56334f9514a7221daa516506b3e183d4b8397c31a1