Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec51a7993c012b68…

MALICIOUS

PDF

71.3 KB Created: 2021-06-07 18:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 0ee2787d37f96e4abe9f52667e5d739f SHA-1: 7e6bc64b86eefe5f5ab6e24a63e16bffe92fea91 SHA-256: ec51a7993c012b68020cb0ea534cb10ece33cfa440d86430d70e5d6a9b1aaae8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting or domains with low reputation, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO manipulation or to distribute further malware. While no scripts were directly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://synerhu.ru/pbw?utm_term=biblical+exegesis+example+pdf PDF link annotation
    • https://burigazipe.weebly.com/uploads/1/3/4/7/134764527/e1eaf3e.pdfIn PDF document text
    • https://fezinonod.weebly.com/uploads/1/3/1/0/131070080/8228157.pdfIn PDF document text
    • https://rezomiwutamanap.weebly.com/uploads/1/3/4/3/134362688/paxuwi.pdfIn PDF document text
    • https://xavubetikobu.weebly.com/uploads/1/3/4/4/134474291/jukejadetukaj-wajidesa-renolafinopa.pdfIn PDF document text
    • https://manadazalivufud.weebly.com/uploads/1/3/4/3/134358645/a073bb697b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b530c7bd-0bde-4183-a41a-061443b0d933/english_speaking_practice_test_online_free.pdfIn PDF document text
    • http://nutafojijoki.pbworks.com/w/file/fetch/144752268/97807521470.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/f/hollywood_movie_tamil_dubbed_free_download_tamilrockers.pdfIn PDF document text
    • http://xalanupuzewo.pbworks.com/f/trueway_asl_workbook_answers_unit_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55182ebd-704d-483a-bd74-0b1a47b76c20/a_series_of_unfortunate_events_book_3_word_count.pdfIn PDF document text
    • http://redelaw.pbworks.com/w/file/fetch/144632808/what_is_esr_in_blood_test_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25febff5-f6b4-418d-9ba9-ecc1badd2f6b/gevupawozaref.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c7659c2-ecb3-4c03-aa61-1243f4b62794/what_does_sensory_language_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c555490-2b71-4b13-b9f6-85e43df21554/riwuwume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b65e8ba-641f-4df7-bef5-3b67655ac473/nineridevetisupizizanipeg.pdfIn PDF document text
    • http://zetewufor.pbworks.com/f/tutorial_corel_draw_x8_bahasa_indonesia.pdfIn PDF document text
    • http://venatulafiz.pbworks.com/f/is_carbon_dioxide_an_ionic_or_covalent_bond.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_off0000d95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95C 5636 bytes
SHA-256: 27eb0560df5a4c8020477e38faadda5f0a168728815a3bce03fd7664852c003b
font_01_sfnt_off0000ec7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7E 10108 bytes
SHA-256: c59b83fa76b5aff981f59dcf4c9bcc93e07ebf625b85a695a230a1ab30bb8a8d

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