Malicious PDF — malware analysis report

Static analysis result for SHA-256 87377aed42b61ecb…

MALICIOUS

PDF

45.7 KB Created: 2020-11-09 03:52:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-02
MD5: cb9676f431d2b23a28c8c1c2b554cbf7 SHA-1: 4bd637bb8149ffbbc8d57c86d751452e357a33ca SHA-256: 87377aed42b61ecba7b1292052c985195dca9dc035bccb8908a2fb3830b5b39d
144 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffe.ru/123?keyword=lost+yahoo+password PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387408/normal_5f8dc53699647.pdfIn PDF document text
    • https://seriraradekabas.weebly.com/uploads/1/3/4/0/134016679/fosiwu-fufezi-sefudit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368493/normal_5f8bb807a656b.pdfIn PDF document text
    • https://jeponiruwapin.weebly.com/uploads/1/3/0/7/130776483/lupasufevazetamu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367650/normal_5f8b733e3e69b.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00007406.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00007406.bin)
    • https://uploads.strikinglycdn.com/files/24553f77-9b25-48e5-8ff5-972b17d37760/9996062232.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d035a79-55b6-4bfd-88aa-0a1de73b4fff/tanesidijabu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea0974be-f4be-48c5-b8fb-1c1825f0e5ff/36117887171.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb701397-c9d0-4f58-bed1-b3c1641125ac/didavitumaruzawetidunudav.pdfIn PDF document text
    • https://xalufavavoro.files.wordpress.com/2020/11/tavati.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7947df4-a44e-41de-b31a-6323e51e6319/mifopososutarin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/380d3926-f1b7-44fd-9dcc-4fb16114c7f8/roluduximikakixi.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/76133198690.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/3717831453.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2f6cec6-eaf5-4ff5-ba74-42c043e47f49/39976099053.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 extracted file (font_00_sfnt_off00007406.bin)

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7406 5152 bytes
SHA-256: 626f32144c240c3b665faa249542e027e3f01cd829439224e2dddde3f221de19
font_01_sfnt_off0000859f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x859F 10744 bytes
SHA-256: 46fb3c4a38d1d6e725f6e6ffdc154c27756f33b329024c84b6c59ca60290020d

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