Malicious PDF — malware analysis report

Static analysis result for SHA-256 6598c0ec58fa9286…

MALICIOUS

PDF

76.6 KB Created: 2021-02-15 07:59:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 217ab2c7c209b21647b4bc92040609a4 SHA-1: f8970e0c0e615f96c8c50906f4743969039e1da9 SHA-256: 6598c0ec58fa9286b7bb6e04c13245bc9992908f101d1ed989729b8acd930a8e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable hosting and flagged as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites.

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://bologen.ru/123?utm_term=2+examples+of+centripetal+force+ap+human+geography PDF link annotation
    • http://quickstore.pro/algebra_questions_and_answers_grade_9okp5m.pdfIn PDF document text
    • http://markettop.pro/nezuxibotusutuxozepixeqtj2.pdfIn PDF document text
    • https://cdn.sqhk.co/voxedijudibo/dzijYn0/fake_call_2_prank_friends_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488604/normal_5ff80545abccf.pdfIn PDF document text
    • http://wikurabafewo.iblogger.org/microfiber_fleece_sheets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387033/normal_600cde247b5fd.pdfIn PDF document text
    • http://infonewsuk.site/nostalgia_electrics_retro_snow_cone_makernbr1l.pdfIn PDF document text
    • http://kinoogf.space/don_t_touch_my_phone_wallpaper_for_girlskmzmb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501029/normal_5fee6f8607e57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494149/normal_5fe21beb83e80.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://linakagiwabofa.epizy.com/brother_in_arms_3_apk_mod_offline.pdfIn PDF document text
    • http://wawuzir.epizy.com/shiva_bhakti_songs_in_telugu_free.pdfIn PDF document text
    • http://zanobunu.epizy.com/base_form_simple_past_past_participle_list.pdfIn PDF document text
    • http://lusafawapinoxe.rf.gd/free_unzip_program_for_windows_10.pdfIn PDF document text
    • http://betemuzisifigej.epizy.com/analise_morfologica_exercicios.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_off0000ef68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF68 5636 bytes
SHA-256: b781bb5f1953f7262f4076d75aa99e9ac6c1d692e1d89e1c0d6d3580a8dca9b4
font_01_sfnt_off00010275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10275 10140 bytes
SHA-256: 79f0eac91be0b868e6e9745545245117c0392b9b62588d66f0b4950b73323ece

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