Malicious PDF — malware analysis report

Static analysis result for SHA-256 a385b68c34673437…

MALICIOUS

PDF

57.3 KB Created: 2020-11-07 09:26:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: a3a842a8dfbe3f3d23b081903db6e8ad SHA-1: 13d3208da945cec677b7d84cc2c77e947ab2ccc6 SHA-256: a385b68c346734374de416e760cc409411e438dcb810abe237be8842f65c35b9
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=welcome+back+to+school+letter+samples PDF link annotation
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/zanazanekoxel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451205/normal_5fa408dbc96c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365634/normal_5f8741b42b4e7.pdfIn PDF document text
    • https://misutinulil.weebly.com/uploads/1/3/1/4/131407711/bubozum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/kalnirnay_november_2019_marathi.pdfIn PDF document text
    • https://zodanolafaxe.files.wordpress.com/2020/11/saxon_math_8_7.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/neoliberalismo_breve_historia_del_infierno.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/49410029316.pdfIn PDF document text
    • https://degareke.files.wordpress.com/2020/11/42559952430.pdfIn PDF document text
    • https://xewavevu.files.wordpress.com/2020/11/21407613593.pdfIn PDF document text
    • https://pozeduribo.files.wordpress.com/2020/11/xubaxufav.pdfIn PDF document text
    • https://gezafetino.files.wordpress.com/2020/11/60509036905.pdfIn PDF document text
    • https://koxulere.files.wordpress.com/2020/11/tezurir.pdfIn PDF document text
    • https://mijogegum.files.wordpress.com/2020/11/wudamozavagaz.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/nomovagul.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/posulin.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/61590814010.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/93042055655.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C79 5392 bytes
SHA-256: 55bc82ae5e553f5bfd69dc8ad7b5c65b8d33e5a4e6d17786ff05cec673856d9a
font_01_sfnt_off00007ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EA1 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off0000872e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x872E 9616 bytes
SHA-256: a3299bdb0aac08b9d1eb6ff0bcbf7860f74d984f682430493476641d5c6daeef
font_03_sfnt_off0000a863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA863 26824 bytes
SHA-256: 06a6c9afd98a996558454193bc8cff463a38c69e270c852973641a1618f80d1e

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