Malicious PDF — malware analysis report

Static analysis result for SHA-256 a345b25ba175ad3a…

MALICIOUS

PDF

41.4 KB Created: 2020-11-05 17:14:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 03c133161c673a946ca7e8711b4b9105 SHA-1: 7ee22324fc593b69c2c7acbef787411a341a6891 SHA-256: a345b25ba175ad3aa8748c9320443f75516e7d980f7e2061d4bb8548890683d8
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=dlc+characters+for+borderlands+3 PDF link annotation
    • https://gufavugowiguxu.weebly.com/uploads/1/3/4/5/134590320/golusijuvop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366382/normal_5f8a0de8e80e4.pdfIn PDF document text
    • https://sexozorojupur.weebly.com/uploads/1/3/4/3/134390270/tinagobavotamizugut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5f86f96b3295d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374704/normal_5f8d6ddb73d11.pdfIn PDF document text
    • https://jamafijuzu.weebly.com/uploads/1/3/1/4/131437216/3007ddf5a63655.pdfIn PDF document text
    • https://gibitiwatu.weebly.com/uploads/1/3/0/7/130776060/4046528.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443594/normal_5f9d28ce42da4.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/sisaxu/novejolarazek.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/meio_ambiente_resumo.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/applied_physics_jntu.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/xegozatikinajevumerewa.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_off00005f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F27 5412 bytes
SHA-256: ce94bd66a7cb937a825d7e7147897d956f8f5c9ec6fcaa5863bd33d5c95c9a37
font_01_sfnt_off00007189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7189 11060 bytes
SHA-256: 7bbd4143b56eaa9d6b6d3a5180335b56b87f0dc8ec329e890296a4036b0d3998