Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f1a8e219213c55…

MALICIOUS

PDF

42.7 KB Created: 2020-11-06 03:08:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 42a00efcabbfe127c51194a539ce2d39 SHA-1: 16033f6d6d2e2f4a4388058b993a0ff6b147b443 SHA-256: f5f1a8e219213c55208dbda5da278f03f5e36cdf9419f85c45aad3e1fb36037d
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=death+run+3d+unblocked+game+76 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369908/normal_5f8c8c7a2c2a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406168/normal_5f91d83f4023e.pdfIn PDF document text
    • https://narogigadi.weebly.com/uploads/1/3/0/8/130874066/fotevaxu.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://s3.amazonaws.com/tuxutedi/jevovapenigakixoguxe.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/postdoc_application_cover_letter_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/88175137043.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a1acd4b-f90d-4548-8d70-aead7a5319a8/mari_illustrious_makinami_age.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/41807296431.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/javavageximelibirokazo.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/49517976577.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/chrome_os_iso_download_vmware.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_off0000595d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x595D 5608 bytes
SHA-256: e4ecb29fc13c85bec862c8bedc6ad22aa0be83f63aa05b2dcb208d7144417f6b
font_01_sfnt_off00006c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C48 10352 bytes
SHA-256: b8eb4d4c34b015af26817043978a2aca5ae279b94869b4c4c18f908fd04c1a68
font_02_sfnt_off00008fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FA3 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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