Malicious PDF — malware analysis report

Static analysis result for SHA-256 981815db2d709b64…

MALICIOUS

PDF

69.0 KB Created: 2021-03-24 16:10:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b2ecde891d36739faf5169c8beecda55 SHA-1: e15f01b5777a65a033fa3b37738b99a1829a5705 SHA-256: 981815db2d709b6418a93d9211a3e58051e701296039e23aece2fd512324de17
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting or suspicious domains, suggesting a link farm or phishing attempt. The ML classifier strongly indicated maliciousness. While no scripts were extracted, the presence of many external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate an attempt to redirect users to potentially harmful content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://nipisod.ru/wix?keyword=ap+human+geography+chapter+5+reading+guide+answers PDF link annotation
    • http://nuzidixiwetor.22web.org/cant_see_my_maxtor_external_drive.pdfIn PDF document text
    • http://gutenorexus.iblogger.org/splinter_cell_chaos_theory_total_missions.pdfIn PDF document text
    • http://gelumagiz.iblogger.org/pepefarevimonewunepabusu.pdfIn PDF document text
    • http://wovitibiki.22web.org/joindre_deux_fichier_ensemble.pdfIn PDF document text
    • http://vimebadu.22web.org/kasena.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/patilawasu/yakuza_kiwami_2_date_guide.pdfIn PDF document text
    • http://suvapik.epizy.com/catia_v5_tutorial_free.pdfIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_9d3122bc1d7043f8a8d0fea86adf2730.pdf?index=trueIn PDF document text
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_d7826b2a519f48ca8961bdb8cb3724c7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba8a2d2a-ac03-473d-8a25-facad51e2c1e/95032771481.pdfIn PDF document text
    • https://8ca15cf9-c5bf-4329-906a-32df3c7b5ab7.filesusr.com/ugd/4ca7f5_3c246afd1f0e409389c198f4b1879fdc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a5ca525-0eaf-410c-8d52-7a2f6ccd81df/what_is_sociological_theory_definition.pdfIn PDF document text
    • http://doruxexim.epizy.com/10638337499.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6be6503-3e41-4f8d-910b-940ae2120a77/pakuvekupijezakisa.pdfIn PDF document text
    • https://c1bbde11-5cda-4f7c-8b74-b2fe90b484f5.filesusr.com/ugd/1c8c6c_acae0d5c14c94f618ad78ab89c03acb6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa58f2d4-07bf-45fa-abe4-738f89786e0a/reveries_of_a_solitary_walker_gutenberg.pdfIn PDF document text
    • https://a0a5ada1-270c-452f-b092-d943fc6f0dc0.filesusr.com/ugd/306762_644420a3149341498250e4f545e384c3.pdf?index=trueIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_b4e2a2fb56a8481ea2c2b652476d6f18.pdf?index=trueIn PDF document text
    • http://divonuniset.epizy.com/bogelesugitofixafomim.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/google_chrome_browser_for_android_4._0.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_off0000cc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC41 5764 bytes
SHA-256: 5f1ae347fbd8e07b7cf907afcd59a3893e0d697f69439e59e112130704e2e8db
font_01_sfnt_off0000dfd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD1 10864 bytes
SHA-256: 3ffd8c2c47a6821610c16abafc83bec668a4f33cf1df0e9504120d7c9e8ee47d

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