Malicious PDF — malware analysis report

Static analysis result for SHA-256 4186acb0d2931ea5…

MALICIOUS

PDF

74.3 KB Created: 2021-03-20 23:17:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: b5b199fecc0457523d6acd1fae8882a5 SHA-1: a1b572a171c23062447a5f16b660c00a315b56d3 SHA-256: 4186acb0d2931ea5c255c7dad7d291c0bb6ee8cf04785676e84afd5f0fad5f46
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful websites. The document body, though heavily obfuscated, appears to be a lure related to search terms, further supporting a phishing or malware distribution attack pattern.

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://lozipotod.ru/aws?utm_term=easy+anime+characters+female+drawing PDF link annotation
    • http://wotaxatumumodok.sportsontheweb.net/berserk_manga_english.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452400/normal_5fff285f1f46a.pdfIn PDF document text
    • http://wodekenizowa.getenjoyment.net/85284521595.pdfIn PDF document text
    • http://wemuwetafivaxe.sportsontheweb.net/wenegik.pdfIn PDF document text
    • http://tulusujubige.mygamesonline.org/how_many_years_to_become_an_emt_in_california.pdfIn PDF document text
    • https://cdn.sqhk.co/nunologen/INdjejf/latest_netflix_for_android_4._4._2.pdfIn PDF document text
    • https://cdn.sqhk.co/sopiloroda/OhjLbAR/countryballs_memes_em_portugues.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484636/normal_6048751f5764a.pdfIn PDF document text
    • http://wivuperafuzo.mypressonline.com/constituio_do_estado_de_alagoas_atualizada_2020.pdfIn PDF document text
    • http://jologedeb.getenjoyment.net/63461574885.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417817/normal_603ceec330e47.pdfIn PDF document text
    • http://didibemez.scienceontheweb.net/another_day_of_sun_piano_sheet_music_free.pdfIn PDF document text
    • http://metoxegid.mygamesonline.org/taking_sides_clashing_views_in_world_politics_17th_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/suxavawudomo/iiaiaFI/60855722169.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450141/normal_604adc2abb1e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421466/normal_5fd5ff6faf951.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luxupovokajaf.onlinewebshop.net/bridges_in_mathematics_grade_5.pdfIn PDF document text
    • http://luvabokinoleg.onlinewebshop.net/gawugonolamen.pdfIn PDF document text
    • http://ligoroxenafof.atwebpages.com/acr_form_delhi_govt.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_off0000e5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E4 5588 bytes
SHA-256: 32ed50cfddd0f0c5be802df6108048f78311376280a423838f4dbbc8b757f930
font_01_sfnt_off0000f8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D5 10200 bytes
SHA-256: 20bf984f07d2946a3e0a5a8c31b801e259195bd5d46e3bffb7f8c8ed3705dfe1

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