Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba6bff6bcc1fb017…

MALICIOUS

PDF

48.7 KB Created: 2020-11-06 04:03:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: e725791020d5dea7565e9e0d3d6b22ad SHA-1: 3c84ccc2fbb32e535072e62231c8a330a47f98cd SHA-256: ba6bff6bcc1fb01787a1045653827f81d8c97b2cd98ebd5917d6cb9716678b97
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://trafftec.ru/aws?keyword=1040ez+form+2016+printable+irs+forms PDF link annotation
    • https://pafetuvuwube.weebly.com/uploads/1/3/4/3/134321561/168628.pdfIn PDF document text
    • https://gexumuvebevo.weebly.com/uploads/1/3/4/3/134312536/durosadinexaz_leluw.pdfIn PDF document text
    • https://kirebokiva.weebly.com/uploads/1/3/4/6/134634247/8987340.pdfIn PDF document text
    • https://fuvipizewovotat.weebly.com/uploads/1/3/1/0/131069886/dolizu-lopumozezabajij-dunabobegal-lapado.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/2d3cea76-4800-4b67-99c2-52d1b22853bd/ripujilalebezogibezux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50b69cb4-77ba-46f7-a639-957a952aecc5/73854123081.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d3cf39a-98fd-424e-a637-ee2880991481/apostila_de_matematica_para_vestibular.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cca9c252-4b35-4f63-bfbe-53d2614c0f86/23354652171.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35acff11-1726-4621-9425-29f8bb49befd/kuzoruluduge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/450e0388-2116-4398-a340-ca585c1d037a/77844240705.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/568ce278-676a-49c0-a76e-af73e065e75c/56189963104.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_off00007011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7011 5496 bytes
SHA-256: ebb1f9d740cd04dfa540e87d2a6722851e769dd932f942a1f07bd147258aa11a
font_01_sfnt_off00008297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8297 10856 bytes
SHA-256: 11f5426c5c1f16168f3206838541eaed12e093b70cba4dc0d2155391507ce7d9
font_02_sfnt_off0000a7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7AE 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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