Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d8dc40a8722c771…

MALICIOUS

PDF

76.2 KB Created: 2021-03-19 17:54:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 25f680b813c602e56ff8b1d22c1cbfe0 SHA-1: b4c1885da3ea9cd191c572b1cac2c62edd6011d2 SHA-256: 0d8dc40a8722c77178c97528241fb624e674bfd059d65543ca13c196b4b8d577
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to an 'answer key', aligning with phishing tactics. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/wix?keyword=realidades+2+capitulo+3a+workbook+answer+key PDF link annotation
    • http://lupazul.mywebcommunity.org/calendario_escolar_2020_sep_195_dias.pdfIn PDF document text
    • http://lnstagaram-verifiedbadges-from.com/wonisadegesavunenun.pdfIn PDF document text
    • http://getepitisux.mywebcommunity.org/64043453710.pdfIn PDF document text
    • http://1ux.site/attahasa_kannada_full_hd_movieeq51a.pdfIn PDF document text
    • http://zevibeponakat.getenjoyment.net/personality_disorders_dsm_5.pdfIn PDF document text
    • http://gafabotipunofu.mywebcommunity.org/13058307602.pdfIn PDF document text
    • http://alcozerox.com/compound_subject_verb_agreement_worksheets_with_answerscfpjd.pdfIn PDF document text
    • http://pukujadud.getenjoyment.net/ielts_writing_task_1_and_2_samples.pdfIn PDF document text
    • http://kojazunupetip.mygamesonline.org/sinuven.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/inkscape_software_free_download_full_version_for_windows_xp.pdfIn PDF document text
    • http://vizojuzoninunoz.scienceontheweb.net/hoover_power_path_pro_xl_carpet_cleaner_manual.pdfIn PDF document text
    • http://peludofnor.fun/remove_duplicate_cells_in_google_sheetsqv5v2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7463942f-65e4-4cac-83f6-1b0ddb519106/xatarazuroxaxupeti.pdfIn PDF document text
    • http://piwolimosopobu.myartsonline.com/manual_gopro_hero_3_silver_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0c2155b-55d8-4533-88a0-d563a9e33f9c/the_vision_david_wilkerson_book_buy.pdfIn PDF document text
    • http://zipulosi.atwebpages.com/what_does_a_manometer_measure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0758e69-6b91-4f38-9eb8-45247dc4d763/74177210116.pdfIn PDF document text
    • https://2903667b-e544-4972-ac7f-e5855aaa9b37.filesusr.com/ugd/2cc660_5d3df7987dde4618b7f76bd2647d50ed.pdf?index=trueIn PDF document text
    • http://ralirajuz.atwebpages.com/bosquejos_biblicos_cortos_para_predicar.pdfIn PDF document text
    • https://92fa68c6-d088-48c5-94d9-776fe0504fc0.filesusr.com/ugd/5a053b_f737943226f44ecba15b71e364c17b5b.pdf?index=trueIn PDF document text
    • http://lolunoxij.myartsonline.com/good_to_me_audrey_assad.pdfIn PDF document text
    • http://woranuganavot.myartsonline.com/36853898940.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA61 5768 bytes
SHA-256: caad54c78325ab34cd16f8bc204febcb5ffdb8c14aa7c86e60e253e533b7faef
font_01_sfnt_off0000fe2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2C 10344 bytes
SHA-256: ba80989975b4eff27010c3e45ea452894463d9ced3e3ab61e90d9504f6a1b95e

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