Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8df8f98873a158…

MALICIOUS

PDF

37.2 KB Created: 2020-11-07 13:06:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: b833a17d45436c290d550e10cee01445 SHA-1: e1b73c3441971c2fb982d7d56f121306f996ce8d SHA-256: 3a8df8f98873a1588d4a4a1b267276940082a5d016b1a38f34aaa7b046eb6bad
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=climatological+data+by+city PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403421/normal_5f9ff4a45874b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391621/normal_5f99965e7799b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389571/normal_5fa60489a9c46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407749/normal_5f9248d5887ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414677/normal_5f9726b27422c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368999/normal_5f8eea950e4e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427519/normal_5fa5ed78bd6a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366308/normal_5f8e976f6249b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369768/normal_5f8918a1e7403.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389097/normal_5f8fd7be2a858.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/257f6cad-b338-4fdb-8b82-38f44aa2b1f6/deritiz.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/smackdown_live_stream_youtube.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/12149385780.pdfIn PDF document text
    • https://fifidoged.files.wordpress.com/2020/11/74660964922.pdfIn PDF document text
    • https://bakazowoti.files.wordpress.com/2020/11/formato_para_poliza_de_cheque_en_exc.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_off0000525b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x525B 5132 bytes
SHA-256: bb5b46ee21709ae6eeb1244906009c6ab8e1fc29fbb175c246e9d7bb189ea8dc
font_01_sfnt_off000063bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63BD 10804 bytes
SHA-256: 19ab98738a2fe35411e3a6ad7a2c8799fd3b3db45074bfc064d23d438b2d3432