Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f153ebd7b33fda7…

MALICIOUS

PDF

75.0 KB Created: 2021-02-27 00:27:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 7f0d71d14f7a5fe1a463dd09099478ca SHA-1: a84a150b3b75fb3a501bdb40a9bdb761b8b21253 SHA-256: 9f153ebd7b33fda71054490c3e579c382547124f427fc6389ea67ddc03e32dd5
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to 'jacksth.ru' which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to downloading a certification book, a common tactic for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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 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://jacksth.ru/award?keyword=java+8+certification+book+by+kathy+sierra+pdf+download PDF link annotation
    • https://cdn.sqhk.co/golomamone/hgjtC6T/recargas_doble_a_cuba_cubacel.pdfIn PDF document text
    • https://ludunijup.weebly.com/uploads/1/3/0/9/130968942/571239fda.pdfIn PDF document text
    • https://cdn.sqhk.co/titubebojek/hiUGhb3/dofuwenirijijepirol.pdfIn PDF document text
    • https://butopejejix.weebly.com/uploads/1/3/2/8/132814220/3094209.pdfIn PDF document text
    • https://gapuropiti.weebly.com/uploads/1/3/2/7/132740804/2891292.pdfIn PDF document text
    • http://gonugotez.22web.org/how_to_turn_on_the_function_key.pdfIn PDF document text
    • https://cdn.sqhk.co/delojiwuguj/ejdkieF/honda_gx160_motor_spark_plug.pdfIn PDF document text
    • http://fajujefa.getenjoyment.net/the_go_giver_summary.pdfIn PDF document text
    • https://titumakusijuvap.weebly.com/uploads/1/3/4/3/134353199/1933866.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fevasakexelima.epizy.com/play_store_app_stuck_on_pending.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/mapireziwal.pdfIn PDF document text
    • http://pagiwufuvefukuf.epizy.com/nolal.pdfIn PDF document text
    • http://lepevalir.rf.gd/91456172259.pdfIn PDF document text
    • http://xevaxujexodo.epizy.com/dresden_files_battle_ground_review.pdfIn PDF document text
    • http://vexabimumemig.atwebpages.com/15510658397.pdfIn PDF document text
    • http://xojakejib.epizy.com/zojedurufubarurunutin.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91C 5884 bytes
SHA-256: c8ccb42e25be4ecb0212c642986a8ebf65a848dfeb2c5ea8b0d674055d6b4da1
font_01_sfnt_off0000fd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD41 10492 bytes
SHA-256: db5db43bb1b91937bdeeef214ad284936d69416d794c650fdec2c7dcf3c92a88

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