Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c5308f0d4313dd…

MALICIOUS

PDF

40.3 KB Created: 2020-11-05 18:03:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 83b4f784d4fd91dc4754acef2d8371a8 SHA-1: de42b4de19aeb341ff8528b42961250b41b45ba2 SHA-256: 41c5308f0d4313dd2ec734002f359896e5708d931bb50abf63cbe5ab17c0d95e
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/strik?keyword=code+of+ethics+for+coca-cola+company PDF link annotation
    • https://junafoxotoroj.weebly.com/uploads/1/3/0/7/130738975/roxemibemot_fopixuruzutin_xewar.pdfIn PDF document text
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/kijozimaruvav.pdfIn PDF document text
    • https://bukusafirede.weebly.com/uploads/1/3/4/2/134266240/gepazogatesu.pdfIn PDF document text
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/gulafase.pdfIn PDF document text
    • https://lubozukutiximik.weebly.com/uploads/1/3/4/4/134472848/7797768.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/fofeguj/acetilcisteina_xarope_bula.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/systematic_theology_berkhof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daf064c7-0b02-47fd-aab6-a3b3dd1eb475/tuwox.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/mivoxep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba3d90a3-bed2-45cf-94b6-75c7e328a973/vefilopujibad.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_off00005e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E8B 5432 bytes
SHA-256: 7025158565bc37a40a5ffead5cca4b97ea1b9e4764fc61e6b9337c911a3802e5
font_01_sfnt_off000070e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70E8 10352 bytes
SHA-256: 365f20ce8f9f03e6f0f54d438799767cfac36af0192796cf1f9ca87c74fdf290