Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e63a9b1f4bebdb0…

MALICIOUS

PDF

44.2 KB Created: 2020-11-09 16:59:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 908ff294a4688e17c6ad683cae16efcc SHA-1: 19c84cb15881d66dede20277e84bcf5755e2411a SHA-256: 6e63a9b1f4bebdb0489a6181e7161a4b595747177b1516c9660a41ecd5cdb45a
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://trafftec.ru/aws?keyword=refurbished+smart+tv+s+cheap PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385026/normal_5fa26768ad1ed.pdfIn PDF document text
    • https://lumifuwuzuzeb.weebly.com/uploads/1/3/4/6/134698668/7338916.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369511/normal_5f8bebb353dda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464311/normal_5fa6d9fecc085.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476925/normal_5fa88997982e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387033/normal_5f906931d4aa0.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/jajoxulabojaso/nixikusanagusazatetu.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/jawemilasajop.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/pdf_of_multivariate_normal_distribution.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/70815162428.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/district_60_pueblo_schedule.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/ringgold_lawyer_divorce.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_off00006c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C79 5568 bytes
SHA-256: bc37f9b199a21fee6c9bbe89a1c9f001a10cb4ff79a9be6002da889c01b173f6
font_01_sfnt_off00007f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F46 10732 bytes
SHA-256: 9756750fddae75c99ea56bdcff35e866f4899efd9e9e20f00c6f03629f631bc1