Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bb9085777c4dda2…

MALICIOUS

PDF

72.9 KB Created: 2021-03-27 18:41:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd1013ddf866834a0c53361d0e267f18 SHA-1: 70333d418c4bd80832444ea146490640073f9a52 SHA-256: 1bb9085777c4dda208cba4559b4ce68c0303cc339f0292d39041ee37091ecbbe
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/award?keyword=exercice+analyse+2+pdf
    • http://vozuzutiwajuzip.getenjoyment.net/lixubolevogoramorinukati.pdf
    • https://xuredetinumimo.weebly.com/uploads/1/3/4/6/134630251/5253328.pdf
    • http://bufibinokurun.scienceontheweb.net/niledakeri.pdf
    • http://xepuxesadara.mypressonline.com/3d_shapes_worksheet_year_1.pdf
    • https://tabivivefevevu.weebly.com/uploads/1/3/4/8/134889686/9571f8968ea6d.pdf
    • http://sirunome.mypressonline.com/imperialismo_resumo.pdf
    • https://bikigevoxepasi.weebly.com/uploads/1/3/4/7/134716722/8715184.pdf
    • https://dizegeduwawab.weebly.com/uploads/1/3/4/3/134374994/c1cb9ed10.pdf
    • http://jesofoma.getenjoyment.net/vemoropen.pdf
    • https://nobopejulalajib.weebly.com/uploads/1/3/4/6/134621416/pitudonaxuxisi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/genukopapovixo/nyc_doe_calendar_2018-_19.pdf
    • https://s3.amazonaws.com/dobesogum/kajizewi.pdf
    • https://s3.amazonaws.com/borokegujuzero/dalokozenafepovududususa.pdf
    • https://77abcf6a-1f47-4233-a5f7-28832101be0a.filesusr.com/ugd/e29e5c_ee4003e405114bd18e8de3a476ac8abb.pdf?index=true
    • https://0f72d47d-2543-49f7-9e1e-a79cec7fe7ed.filesusr.com/ugd/9c43ec_513cb9a55fbe459d8e14e1ee89e10278.pdf?index=true
    • https://s3.amazonaws.com/wumodukubaru/purchase_agreement_addendum.pdf
    • https://s3.amazonaws.com/xupizewuxere/bella_ciao_english_version_free.pdf
    • https://s3.amazonaws.com/kovozenamofox/98076045347.pdf
    • https://s3.amazonaws.com/livivuvuwugeb/xugemafevug.pdf
    • https://s3.amazonaws.com/midaguvimabof/how_to_remove_navigation_bar_android_pie.pdf
    • https://s3.amazonaws.com/jakujakula/linguistik_online_stylesheet.pdf
    • https://s3.amazonaws.com/paxuvagal/bostitch_miii_floor_stapler_manual.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db8f.bin
bc110151a794400591d73dba2c5827efbc2b06c47350b19f70b9da401170b5ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8F 5408 bytes
font_01_sfnt_off0000ee1c.bin
05a8ba2f00a4d63a2c9985e09ec9be4cc83047dcffc95ffd9c857d5bad126a7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1C 12004 bytes

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