Malicious PDF — malware analysis report

Static analysis result for SHA-256 d45c6e30fe233c69…

MALICIOUS

PDF

68.7 KB Created: 2021-03-04 04:21:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 886400916767c991dc7d74ea7d054151 SHA-1: e52c59203b41051ede2a5f6149480faa6d246f35 SHA-256: d45c6e30fe233c69bb4e9f9fb2350a7f8b65829f517ed60ef2b0a74cfb178cef
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, references search terms, suggesting a lure to external malicious websites.

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://xezojetit.ru/wix?keyword=tears+of+a+tiger+answers+pdf PDF link annotation
    • http://wapividazofar.scienceontheweb.net/transformations_of_square_root_functions_worksheet_answers.pdfIn PDF document text
    • http://laludinemolat.sportsontheweb.net/scanner_avec_hp_deskjet_2547.pdfIn PDF document text
    • http://gtmedis.com/xivijabumedojabkhn13.pdfIn PDF document text
    • http://jusukigib.sportsontheweb.net/34247613513.pdfIn PDF document text
    • http://fsbsiod.com/punctuation_rules_english_hyphenybat8.pdfIn PDF document text
    • http://perevod-card2card24.site/79745193541dp4ba.pdfIn PDF document text
    • http://nature-ital.space/science_studies_weekly_5th_grade_answer_key_week_8gu25a.pdfIn PDF document text
    • http://saroforati.medianewsonline.com/planes_y_programas_2011_primaria_sexto_grado_matematicas.pdfIn PDF document text
    • http://airet.space/minecraft_tale_of_kingdoms_2t4q0n.pdfIn PDF document text
    • http://nukicew.xyz/parkinsons_voice_exercises360ly.pdfIn PDF document text
    • http://topcreditcheck.info/john_deere_la175_parts_manuald6xb2.pdfIn PDF document text
    • http://health-top.ru/is_ib_visual_arts_hardkfcco.pdfIn PDF document text
    • http://tvoeobrazovanie.fun/sepinuwurazofujesifodor094ru.pdfIn PDF document text
    • https://valodoxajub.weebly.com/uploads/1/3/4/4/134435871/82c3099.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
    • http://dakafatuvuguviz.atwebpages.com/bally_slot_machine_repair_manual_download.pdfIn PDF document text
    • http://gujimosodaza.myartsonline.com/sex_and_the_city_2_cast_names.pdfIn PDF document text
    • http://wejopapoxevore.epizy.com/77103302194.pdfIn PDF document text
    • http://komivarutu.epizy.com/best_free_books_sites.pdfIn PDF document text
    • http://sajogaluka.rf.gd/89970971800.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_off0000c5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AD 5008 bytes
SHA-256: 611f18c316aec0bbdec322f7bd16935c119f7ad76e5e87222b0d996eeee5f9c0
font_01_sfnt_off0000d6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D6 9568 bytes
SHA-256: f1d7cb777539cac5ddf8d005fcf4b20ca1b7028bc720e47dfe457f0794a21f42
font_02_sfnt_off0000f788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF788 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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