Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f7801e62a9aa67…

MALICIOUS

PDF

37.0 KB Created: 2020-11-07 19:39:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: fce25a0a26493fa1a3bd207719c8d3b0 SHA-1: e02b9fddac4193234d17943fbd94edfb579db816 SHA-256: a8f7801e62a9aa6774712b5623a27c424e77dda71af3768d15484aee17aca8fe
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=accident+at+jefferson+high+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408483/normal_5fa476384303f.pdfIn PDF document text
    • https://lajojixuvoporor.weebly.com/uploads/1/3/0/7/130738555/dezolarawaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387035/normal_5f9033fc17bcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382194/normal_5fa2c9b2897cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5f8765472b4a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366664/normal_5fa5f2074ae3d.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://rizegevoga.files.wordpress.com/2020/11/20386627384.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/bupubi.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/besejazapurigewudinalibap.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/tipos_de_loiros.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/juzobemivabekisat.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/20184852626.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/1009778212.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/78847293121.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/xutipeme.pdfIn PDF document text
    • https://lejenoz.files.wordpress.com/2020/11/26228488684.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_off00004526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4526 5260 bytes
SHA-256: 6e636b52dd2e92732ec7575b2b977d0824706422dc1a0f10bdc9c2a4ecfe4d28
font_01_sfnt_off0000570a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x570A 9952 bytes
SHA-256: 828cc6100e387253b48263c5f9b935c0157707cdf30308a1a715e2126e05acf6
font_02_sfnt_off000078ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78FF 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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