Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf2590ecdad1f062…

MALICIOUS

PDF

52.7 KB Created: 2020-11-05 17:41:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: a0e6116567dc5160115035c9d308c8d9 SHA-1: ec6a365acc751e0989220d65b1858a29254f2fd5 SHA-256: bf2590ecdad1f062966d3136f21ea682ace5ea38e7b17d20e7f10eff0f6a46c7
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/strik?keyword=arvada+west+high+school+baseball PDF link annotation
    • https://bujezabuzi.weebly.com/uploads/1/3/4/3/134310034/tivulebiwuponunad.pdfIn PDF document text
    • https://selamosufuk.weebly.com/uploads/1/3/4/4/134463567/3f268ff25c6.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/ratefunerod.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/tanikanaw/zamexutusavoduzavodivosub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e11b2fcb-0a21-451e-8dba-a8def7b60c03/illinois_income_tax_brackets_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/befevifa/series_circuit_worksheet_episode_903_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/pukituriso.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/bavodogulimepagob.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/frases_en_ingles.pdfIn PDF document text
    • https://s3.amazonaws.com/takeju/blank_nyc_leather_jacket_floral.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55658b3b-77bd-4e2f-bdc2-60c6b9dcc733/68417487065.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_off000068ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68EF 5164 bytes
SHA-256: b1e28374e3290451742583e97cd11ea14a6391e9d3faf99c63fe4964e9aac7c9
font_01_sfnt_off00007aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AA5 11656 bytes
SHA-256: 3e10e0d8bd7257e1ccf04554b14dca696a2d9decfe9c0ef992107e70d2ad3b76
font_02_sfnt_off0000a285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA285 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15
font_03_sfnt_off0000b7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B3 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378