Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c5e13c78011a9e…

MALICIOUS

PDF

72.1 KB Created: 2021-02-09 10:42:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 9ab3146f5835aa088d576ec38ff2032e SHA-1: c9e64c45dbd0cded4f0fdf97ea24680a8ce81c41 SHA-256: c8c5e13c78011a9e5482040f0f8135e4ac189fc87a76b3cae2b0af6b9c0e256b
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to disposable hosting or known malicious redirectors, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure are consistent with techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wb?keyword=subtracting%20decimals%20worksheet%20pdf In PDF document text
    • http://baltika-trans.ru/41116714699rd3ab.pdfIn PDF document text
    • http://lnstagramverifiedbadge-media.com/housing_follow_up_worksheetyt7gg.pdfIn PDF document text
    • http://lesantyqas.online/avast_vpn_license_file_freewhg04.pdfIn PDF document text
    • http://kushtanash.ru/bangalore_university_bsc_computer_science_syllabusz3e6n.pdfIn PDF document text
    • http://goodsun.fun/srsd_writing_model_factszg5uv.pdfIn PDF document text
    • http://meetsol.xyz/pathfinder_character_sheet_editable04f25.pdfIn PDF document text
    • https://cdn.sqhk.co/pezolaje/iYopihB/3235195277.pdfIn PDF document text
    • http://carishr.com/angular_define_array_in_templaterie5z.pdfIn PDF document text
    • http://datab.vip/three_dimensional_shapes_worksheetywnul.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.site/23751877856dl8m4.pdfIn PDF document text
    • http://discovljzg.fun/acalypha_indica_medicinal_uses383ak.pdfIn PDF document text
    • http://limebago.iblogger.org/google_sheet_free_for_mac.pdfIn PDF document text
    • http://mugedly.xyz/active_passive_exercise_downloadg1l3f.pdfIn PDF document text
    • http://thepropheticapp.com/ejercicios_tabla_numero_atomico_y_masico_3_esow2w4g.pdfIn PDF document text
    • http://xonajagavasuj.22web.org/accounting_study_guide_chapter_1.pdfIn PDF document text
    • http://reduslimitalia.website/adversary_crossword_clue_6_lettersygcpm.pdfIn PDF document text
    • http://pagebake.com/primeros_auxilios_bebes_y_niosrn0wl.pdfIn PDF document text
    • http://consequences.space/vatalunewuligamuzirodaxiyuc9r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://valamujunitun.epizy.com/sample_cv_template_south_africa.pdfIn PDF document text
    • http://xotepugiz.rf.gd/economics_gce_2019_question_and_answer.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_off0000db3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3A 5968 bytes
SHA-256: 7234360ce3e325de3a70487681e57077e8ca2d29f7130ba36455967bc164d1fe
font_01_sfnt_off0000ef6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6D 10500 bytes
SHA-256: ab0838f9ae41587151f6ebc596c3bf5f310f1f4a02f854fd0956faa0829fb796

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