Malicious PDF — malware analysis report

Static analysis result for SHA-256 875d563fa789eacb…

MALICIOUS

PDF

83.5 KB Created: 2021-03-08 12:01:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ca3689b21429ad860685ca6ff476992f SHA-1: ed672451f2d8f4579c3b1e5f5556018f53837473 SHA-256: 875d563fa789eacb8e1a853c512a41c8b983be3e090ef56bcb0bb81679c1247c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on suspicious domains. The ML classifier and ClamAV detection strongly indicate malicious content. While no scripts were directly extracted, the structure suggests a malicious PDF designed to redirect users to potentially harmful websites for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/award?keyword=ielts+speaking+vocabulary+phrases+pdf PDF link annotation
    • http://limaxinsto.xyz/anne_rice_prince_lestat_and_the_realms_of_atlantisasbqv.pdfIn PDF document text
    • http://idealica-tufficiale.website/34085699342sjj32.pdfIn PDF document text
    • http://golesaluwo.66ghz.com/bradley_cooper_oscars_2019_performance.pdfIn PDF document text
    • http://form-lnstagramverifiedbadges.com/lefodusofix1h.pdfIn PDF document text
    • http://gifozazupu.iblogger.org/traxxas_rustler_4x4_vxl_brushless_manual.pdfIn PDF document text
    • http://antinomi.design/bash_shell_script_for_loop_continueactfk.pdfIn PDF document text
    • http://card2card.live/derecho_procesal_civil_oxford_francisco_jos_contreras_vacamwg4o.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://836291d8-7b77-40db-be8c-3105928c7ef3.filesusr.com/ugd/aae074_e24156f8621c4ab69c8d890a803c125a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/autocad_lt_2020_books.pdfIn PDF document text
    • http://lelekon.epizy.com/48309449148.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/weather_report_of_delhi_in_august_2019.pdfIn PDF document text
    • http://rijimilaje.rf.gd/instagram_photo_siri_shortcut.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/behind_the_wheel_driving_test_score_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/consonant_clusters_worksheets.pdfIn PDF document text
    • http://zumijuxuv.epizy.com/a_mini_new_baganiya_song.pdfIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_58a00dcf38384abc9d11317c0a5f0379.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vojapu/tesejupukuwokinesasen.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/adjectives_worksheet_for_grade_7.pdfIn PDF document text
    • http://jagofebasej.epizy.com/xazuwevipifawixogupas.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/82648040944.pdfIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_7b7a16e2ca9a41d8851239e72f455f54.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/5768888110.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/blindspot_season_3_episode_18_subtitles.pdfIn PDF document text
    • http://kezaforow.epizy.com/aashiqui_2_video_hd_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/65055634268.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_off0000fc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC28 5600 bytes
SHA-256: 5abd1b12877b029d8905b52a776837f99e4d440b44d3683653d89c25f8e21a27
font_01_sfnt_off00010f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F25 10324 bytes
SHA-256: 2e2dbf5ecea9dc126e988a33a2325c3b43b979b6a63292733c4c82ab2d1bd3d1
font_02_sfnt_off00013248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13248 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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