Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb29580efd515371…

MALICIOUS

PDF

71.5 KB Created: 2020-11-25 12:56:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: bdf3957de4f084ec3b0de01a227a6b14 SHA-1: 1a460ab7b56e4c840c4c4bd6b9f0049de87282c6 SHA-256: fb29580efd5153718cc4af4f054b62f2b4a35660e388ceeae67b4c1a1e7ed65e
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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?utm_term=work+permit+ohio+age PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368474/normal_5f957824b20fb.pdfIn PDF document text
    • https://rudiduwusoxu.weebly.com/uploads/1/3/4/4/134445317/d8996184f09b1.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/jevopemosod/animal_farm_and_russian_revolution_timeline.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/pifimusevezuvekekipewe.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/barron_s_sat_book_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/exercicios_resolvidos_associao_de_resistores_em_serie_e_paralelo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d1bca6c-8fe8-4031-b33b-db3017c6d120/j_krishnamurti_video_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/hartford_public_schools_2019_2020_calendar.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/everything_i_never_told_you_full_book_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/347f288b-b022-43d9-a47b-d1ac214c0007/megaman_the_power_battle_rom.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/mopasokanarowegubamojidi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32ae4af7-eab6-4701-bd1b-2f1d051ccd84/fiket.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_off0000cf4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4D 4784 bytes
SHA-256: cdf5bd18398ac1f9a4809ce3257f57bf4e4cdd98f264b62fcb1d3f68df3a69ab
font_01_sfnt_off0000df9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9E 10740 bytes
SHA-256: 471c446ed616a9d927a8c53a52e85e6639e5b175a9c8154efe9b1f04c6784cf5
font_02_sfnt_off0001036d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036D 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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