Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb0db13981ec887…

MALICIOUS

PDF

76.9 KB Created: 2021-03-29 14:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 191d19efaa96d3d5b9b1b4bea0514e81 SHA-1: c7ebc054ea922918bfbe40360d86107a65653694 SHA-256: 5fb0db13981ec88745b2295bca1a1874d6e0270955dfc2c351d08f8ced6c3565
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and 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 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://botokaw.ru/123?utm_term=burnout+game+android PDF link annotation
    • http://fanitukasi.22web.org/somanowizekawisatatuj.pdfIn PDF document text
    • http://mumopajikex.mygamesonline.org/buddhist_nirvana.pdfIn PDF document text
    • https://cdn.sqhk.co/zezoxomop/ZgficCh/wego_music_city_star.pdfIn PDF document text
    • https://cdn.sqhk.co/besudamuge/igtIghg/v4_engine_cars_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/xalibolopov/PVAhgtF/download_meteor_hammer_io_mod_apk_android_1.pdfIn PDF document text
    • http://sabovibin.medianewsonline.com/upsc_exam_calendar_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/vilubofi/ihaNhcZ/stackers_travel_jewellery_box_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/zosiwutu/4vjhicr/windranger_arcana_2020_release_date.pdfIn PDF document text
    • http://rilomenininun.getenjoyment.net/16229048550.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/jubiferekaka/ignou_b._ed_convocation_form_2013.pdfIn PDF document text
    • http://rixoxufutafugi.rf.gd/tajigarabifitoku.pdfIn PDF document text
    • http://katurew.epizy.com/naxinudotujexejon.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/birepagugixuxesebobugos.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/carry_on_jatta_2_official_trailer.pdfIn PDF document text
    • http://bividit.rf.gd/20981547593.pdfIn PDF document text
    • http://nawevuf.epizy.com/html_form_checkbox_checked_javascript.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/comparatives_grammar_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/19667053922.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_off0000e3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D6 4868 bytes
SHA-256: 952b3b4719a982c5aaf4f6de3ea856f96a4adc94fe9a40b22677a153f06d42fe
font_01_sfnt_off0000f445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF445 10660 bytes
SHA-256: 1da241c4a73acce7a1f59cfa7fc1dabe5e2b6bdb053f7ba42b6aac797848ca2c
font_02_sfnt_off000118a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A2 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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