Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e6aceeff9c75707…

MALICIOUS

PDF

47.0 KB Created: 2020-11-08 16:46:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 7b9c2b3d05beddc4a1edb7cfa9121580 SHA-1: 6941efe5e38548a1b46c8a5e07b006d8aea7900a SHA-256: 3e6aceeff9c75707e870b7a8089681fe13945e25ce1b96e5765babd9f3812326
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/123?keyword=book+the+devil+in+the+white+city+read+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384836/normal_5f8e1212c5624.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366959/normal_5f8fd9e3ea925.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369927/normal_5f9735c6e952e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374851/normal_5f8b6209c02ff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b1f95d28-0301-4cb8-818a-1130c94760c6/gukop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b215bd3-bed8-435e-a6ba-84f9ab8eb646/x_marks_the_spot_location_runescape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f58bd15-c0ed-4826-987b-d4e0c33c269d/21717124343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d574728-37fa-4e1d-9a32-4cf94291eb4a/vajimuzoti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5899855-704b-4fe6-aaf6-9c8b44a8cfaa/telima.pdfIn PDF document text
    • https://vofalop.files.wordpress.com/2020/11/possessive_nouns_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/vebegevokesukaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af5f297c-e0df-43ea-ac76-3f84c7091d12/24706393782.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BEE 5220 bytes
SHA-256: 4de86244f69fa6414270bf042b30fbca831d1c575b6b6eb30a666d929dbad319
font_01_sfnt_off00007dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DBD 10284 bytes
SHA-256: 9bae16a71e385e196225a747b43ad7bdc1b4aac3fc3dba3f0b067885c372e744
font_02_sfnt_off0000a113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA113 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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