Malicious PDF — malware analysis report

Static analysis result for SHA-256 9138972b1813e4bc…

MALICIOUS

PDF

84.5 KB Created: 2021-02-25 07:24:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: cba21a6f8ce363cab5808e14debdcf7c SHA-1: 18d40efd0d1cd59b5af5e81ed111013287744557 SHA-256: 9138972b1813e4bcd07b349e66cc731f8f96ebec560d45bace5cadd53de3e63d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/award?keyword=different+curriculum+model+pdf PDF link annotation
    • http://help-nanny.site/used_taylor_gs_mini_guitar_for_saleuibgu.pdfIn PDF document text
    • http://demumamudu.22web.org/rcog_guidelines_early_pregnancy_ultrasound.pdfIn PDF document text
    • http://megahit.space/wrath_of_the_righteous_beta_accessd2r23.pdfIn PDF document text
    • http://matras-24.ru/q_alimentos_puede_comer_un_diabeticogir7l.pdfIn PDF document text
    • http://braco.ru/sandwich_maker_3_in_1_lidl4ghtw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415742/normal_601a3cb61377a.pdfIn PDF document text
    • https://mokoluwi.weebly.com/uploads/1/3/4/5/134595511/5039c03501f1.pdfIn PDF document text
    • http://tiruxukanemaga.iblogger.org/50273426766.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://livofos.epizy.com/kogibexorazewok.pdfIn PDF document text
    • http://vabepevid.epizy.com/wedding_dress_day_guest.pdfIn PDF document text
    • http://loluwoje.epizy.com/math_grade_9_answer_key.pdfIn PDF document text
    • http://naturesivox.epizy.com/gozixalumanawikal.pdfIn PDF document text
    • http://keberugut.epizy.com/65528248834.pdfIn PDF document text
    • http://durevitulo.rf.gd/close_up_abbas_kiarostami.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF4 1956 bytes
SHA-256: 6b4dd663a1a45629e0042433becf489c3010dfa4eb22a5baed383ecd33b4b874
font_01_sfnt_off00011543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11543 4912 bytes
SHA-256: 99ec51e808835ee94103a2ece35ab784c5b9e59831c643219402c280eae400cd
font_02_sfnt_off000125ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125ED 10196 bytes
SHA-256: 2c2490c6409624c5a265a0f69fb41ee41eb18811d0873a1d69ac6e9bd27f7e6e

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