Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e4ab454fcf39484…

MALICIOUS

PDF

43.3 KB Created: 2020-11-09 09:07:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: df2c1eefc96a89b347fb40d1ecba3246 SHA-1: d872f6a46a8337df654577c7599cd463de01abf9 SHA-256: 1e4ab454fcf3948484e7af2224cf8915dc12651d0a4e08ea8749dea4b5f60fde
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=orthopedic+surgeons+near+me+foot PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469355/normal_5fa82962aa932.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://zolikaf.files.wordpress.com/2020/11/xuriziretigupubovaziduzob.pdfIn PDF document text
    • https://firomikodow.files.wordpress.com/2020/11/sixemotomukomozoxogituno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72b24718-7cb3-4e9f-89ef-baf682986be0/90588999163.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/facultative_vs_obligate_anaerobes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9de709a-173f-4f75-9456-a8a55756f357/94752129671.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb7633af-f59c-4507-bb5c-2cc6fbf3ce81/31473864579.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d3bb5c3-8c96-46ec-8ad5-86c19c988b13/le_nouveaux_florida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a1fa228-d267-430f-b961-5f1979d7878c/ferifuxik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/441a9fc1-3c5b-4e1e-8dc3-830ec5802547/sazokijaxemukaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fae1e9db-f732-4b67-a261-80767f28c7d1/skulduggery_pleasant.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_off00005e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E1C 5444 bytes
SHA-256: 85292e728890af316d8aeea163ebdd6664c1824fd04430a0be306b1a39e9091f
font_01_sfnt_off00007075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7075 10060 bytes
SHA-256: 54121eaf333dc75dbe726bc8f4aa3b247b149b9fa5feeee7dbddc1d75ce7a5a7
font_02_sfnt_off000092d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92D3 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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