Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca623e87eed33e57…

MALICIOUS

PDF

74.8 KB Created: 2021-02-15 19:49:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 84859e5ec0ef411e93e3a22d8cdfab78 SHA-1: 4d15e903fa19c8c1e14cb3f29c7d762e0e5d27d8 SHA-256: ca623e87eed33e578372f27cc0c2b6c2f37a3f062baa350e9f3d6b335b267c12
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains and Weebly-hosted files, indicating a link farm or phishing lure. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary purpose appears to be redirecting users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://jottigo.ru/strik?utm_term=what+is+your+sign+for+your+birthday PDF link annotation
    • https://laxepesijuniz.weebly.com/uploads/1/3/1/3/131383562/gimumuweta_lewejeguzavimut.pdfIn PDF document text
    • https://kanudepu.weebly.com/uploads/1/3/2/7/132740929/876611.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460466/normal_5ff413f66f091.pdfIn PDF document text
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/b155001a7a4.pdfIn PDF document text
    • https://jazitilifa.weebly.com/uploads/1/3/1/4/131414561/6e780f3b9133bd.pdfIn PDF document text
    • http://zalavsky.ru/kupifomijuramubukifbzk1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425768/normal_60192d091b18c.pdfIn PDF document text
    • http://greatholl.com/dare_you_goof9b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503617/normal_5ffb0ff1334ee.pdfIn PDF document text
    • http://muldwych.com/x_plane_10_mobile_flight_simulator_unlockedhtn48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401732/normal_5fe6529d37f45.pdfIn PDF document text
    • https://jusodizepo.weebly.com/uploads/1/3/1/0/131070216/tejudopasinuwezi.pdfIn PDF document text
    • https://xowetigebunagu.weebly.com/uploads/1/3/1/6/131637365/borexusopulegip-fupukavulurin-sakojutelavalik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446147/normal_6000a0672213f.pdfIn PDF document text
    • http://nakrutkavk.site/76855288573miolj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/algebraic_functions_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/body_language_game.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/gcse_english_language_paper_1_examiners_report.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/23510350194.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_off0000e8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AC 5392 bytes
SHA-256: 7657e6b4d1410c809c39d62f396e01d756948eaa32c976180c072a6e4d58e929
font_01_sfnt_off0000fb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0E 10284 bytes
SHA-256: 54d028f96581d82c13ab41a4f0600284528643456e3e122c612171aa0e9d82b3

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