Malicious PDF — malware analysis report

Static analysis result for SHA-256 a34fe5baa76b1c2a…

MALICIOUS

PDF

42.2 KB Created: 2020-11-05 16:38:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: 7ae57b316e916151dbd498d258e675be SHA-1: 5bfc2782f5dc6187329ada32d8026acdf9ce188f SHA-256: a34fe5baa76b1c2ab2ebd7c1d289db715666ac9b18b79368a24f7ef0b37df321
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://traffset.ru/aws?keyword=google+drive+apk+for+kindle+fire PDF link annotation
    • https://relugudikovok.weebly.com/uploads/1/3/4/2/134265752/fimanegi_xewupulusowome.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/kofabube/39250812181.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/gixubosojipulo.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/about_indian_history_in_kannada.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/weathertech_pet_barrier_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/66333454096.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/apk_files_for_fire_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/701d807b-5449-4d44-84e7-cf975661a2a0/pezamidudixitet.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/95054090116.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/activation_code_of_avast_driver_updater.pdfIn PDF document text
    • https://s3.amazonaws.com/xukidosifixi/negexinulit.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_off00006655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6655 5184 bytes
SHA-256: 5b0db5e508fca56887a015e575670cab462f23d9b574bac0c51ad2fb48054b51
font_01_sfnt_off0000781b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x781B 10468 bytes
SHA-256: 9302336f5d7cd4702831c818da108a7fddfe9cf5f6d0c69418be986c119b1747

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