Malicious PDF — malware analysis report

Static analysis result for SHA-256 f575038ab5700636…

MALICIOUS

PDF

54.0 KB Created: 2020-11-06 06:56:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: caae96d1e39c7f450d03d6098a9f4191 SHA-1: d213f60ff59dcf72820d74a2c139277c795b3d71 SHA-256: f575038ab5700636fb47fd57c9249b2a3961a4473d907d6bd3dedf2b64b3cbd8
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=fairy+tail+mangago PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367275/normal_5f8c87c14f2ab.pdfIn PDF document text
    • https://rikisuluwujufa.weebly.com/uploads/1/3/1/4/131452938/f4cca9ce88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401505/normal_5f9cd5d67ba67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379973/normal_5f90d4de0e814.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379615/normal_5f8b7867ae225.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404290/normal_5f92f890bd1bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373999/normal_5f8d1e8cb48fe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca752d8c-ab6f-475c-87f1-baad98888cf7/39452164415.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ca8c089-27df-4e50-9df2-df8f121da49a/27317191036.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/931c3be1-121c-433a-bd97-97bfa318becd/tezuxuxafutuzekokamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83bdc63b-e3e0-47a6-a0bb-1ad60bdb10c1/30501858572.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eeb2104-52b2-4a6f-b763-880c82fb4a99/are_pumpkins_considered_gourds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbc5131e-1525-45f1-b73c-b7aca39f707b/rigotibanef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cac2d22-0513-4eb1-b937-897a0367c95c/nvidia_virtual_audio_device_wave_extensible_wdm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4934e45-905b-4a91-8ed1-51d801d3f2f9/58003262926.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_off000077cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77CB 7820 bytes
SHA-256: a483eb92e4fcc966327d3afaaf6872a52fccfff51a76b43bf1137b97784e134c
font_01_sfnt_off00009280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9280 4884 bytes
SHA-256: 276a65936eb5fa16f92192723eedf886f5730efe53b534ca75fd96565eae73ab
font_02_sfnt_off0000a319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA319 11192 bytes
SHA-256: 602fdaaa6e5bb66cb6507bcd29e998c586e54100787dcdfcf4ada9bddec4cc17

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