Malicious PDF — malware analysis report

Static analysis result for SHA-256 c91a8fda9c7077a2…

MALICIOUS

PDF

40.9 KB Created: 2020-11-07 06:36:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 3c8f3a35763a1a4381e2c22581caad05 SHA-1: d0b5ae1d7c5e8b91b36e9b3f5737f6490e022ff5 SHA-256: c91a8fda9c7077a20aadf31df9cbf940ee78c55910daaadce32906fed496ced3
76 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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=the+complete+guide+to+the+bible+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379234/normal_5f8bae2e6ebdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5f89b92c9dbf3.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/e0940846-d637-4fbf-b7aa-28b452faa244/polk_audio_rc80i_in-ceiling_speakers.pdfIn PDF document text
    • https://s3.amazonaws.com/xafuluxel/giwujilizivokine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24626df6-758e-46ea-9c13-c82099a8f1cb/wedez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12ec7233-ab98-4f0a-8d64-80dade0c8a9c/blynk_iot_proyectos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af0653ff-eef0-4303-9916-e0a05bc4d816/kukasuxisuligoji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9207f0e4-43e2-47b7-87b8-85b143290e59/vosevofovatubuve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4d2478b-6f48-4aed-88bc-df67fb22d6df/sitedopavamozag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0142cb46-1a52-440a-976f-340084ceddc5/xepowejunowemob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0967b17f-7684-4fb1-af77-837323438274/guardian_climaguard_solar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b154fcd4-5cba-4292-a408-e8e75b519179/guy_aitchison_reinventing_the_tattoo_download.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_off00006122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6122 5172 bytes
SHA-256: 436d95a47d7705a9b36785509c18d244610b4902572525e1fdf620aa9a5e7621
font_01_sfnt_off00007298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7298 10808 bytes
SHA-256: bf75e0f6c4f9c76df84b4411dbc22e4fea9390509cc6f93bf7dbc7d6dbe7adfb