Malicious PDF — malware analysis report

Static analysis result for SHA-256 b53f32684ca2916d…

MALICIOUS

PDF

40.2 KB Created: 2020-11-09 16:52:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: aecc443c989a1342fa4bd6d4fcbf7170 SHA-1: 7eabdee6f3d5b346cb3d1e50ea8679dc1668f04a SHA-256: b53f32684ca2916df67720e75c3502a252a460bda4ce0ee1a3038496b494fb9f
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=general+tools+moisture+meter+manual+mm8 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375541/normal_5f8d8662714cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386607/normal_5f8d2a6291b3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5f87325e438d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409818/normal_5f9c4531b7f03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368225/normal_5f87b55df1712.pdfIn PDF document text
    • https://digafixi.weebly.com/uploads/1/3/0/7/130776371/tobufa_kexusixevalaraf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370073/normal_5f9ccefe4dd15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413845/normal_5f9d9a00936f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_5f876ef252b84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381748/normal_5f932dbec2ccb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366362/normal_5f9a5b364bce2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368250/normal_5fa9556795c70.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/48ac871a-ff02-482f-9000-429d0d6c21ad/robaleforuratevefaxezulex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aaca76b-d579-4c7d-b51c-d40239236fb0/36864876550.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16e17a9b-4454-429e-b66e-a8044ed3fe2f/venomowuzefaguzobojegov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de9f4181-90c5-4427-8e6f-29211c1c3c16/wazewotobebogazewobexaru.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_off00005352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5352 1940 bytes
SHA-256: 793e9adb52121413e091d8ba3c4b2e5d0172b35e5bde5e3b575665761c818430
font_01_sfnt_off00005c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C73 5056 bytes
SHA-256: 7c7e8d5ad0643d268ab3f90f4925168fc336cfb880097bfc5bf908e1e4d9f16a
font_02_sfnt_off00006d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D86 11100 bytes
SHA-256: ac27c76ce1956adf4acab27cca2408529ad28f40fae3bfb26107813a0e388577

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