Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f416c1ad2923b3…

MALICIOUS

PDF

44.6 KB Created: 2020-11-07 23:01:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: 9d99938b5bd9d3f0dc3005f18be168e9 SHA-1: 464d302779b93326945b16d321a7e0527df2f0a3 SHA-256: 16f416c1ad2923b32bfa741cddae6780f49b46439a33ab285e29a9a90d7e2b4d
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/123?keyword=honeywell+thermostat+th8110r1008+user+manual PDF link annotation
    • https://dubuzosokiboxof.weebly.com/uploads/1/3/1/1/131163723/vipelejebakurakuwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383565/normal_5f980d020f6d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374366/normal_5f92716f26eea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385869/normal_5fa3728f5bb4f.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/xepolosagigu.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/gomakobez/download_surah_yasin_with_urdu_translation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48860ccb-2abc-4e3d-bf3e-b6f2153225c2/accounting_chapter_6_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/watch_dallas_cowboys_live_on_fox_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wisatutadi/air_fryer_frozen_chicken_wings_dry_rub.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/56224149474.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ba3a259-e235-495f-9d17-486850fd118e/40127890245.pdfIn PDF document text
    • https://likuzow.files.wordpress.com/2020/11/40264502684.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2caa804-9d2b-4798-ba61-ee4061b43b8c/popuguj.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/dotizoz.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_off00006060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6060 5300 bytes
SHA-256: 5ad8bd865148b7fc58c2221834cf90e8e63f74b203ff37b6b7c8eaa0280cb35b
font_01_sfnt_off00007246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7246 10908 bytes
SHA-256: 8822dcd684d3767a9249fd27d4131162fdb4448a3954bbaed4f2fca0a47e8f29
font_02_sfnt_off0000970f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x970F 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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