Malicious PDF — malware analysis report

Static analysis result for SHA-256 73c883ddfaedc42c…

MALICIOUS

PDF

82.8 KB Created: 2021-02-20 03:02:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 1fe0c6a71e1ecf3560ebf8fc09ae4a3d SHA-1: a030a2abdbeceda37293b929383175c6a815c771 SHA-256: 73c883ddfaedc42cd0afba6fe9c105ef5c201cca237704fdfefb5187733b081c
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to a suspicious domain 'jacksth.ru' that is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, further supporting a malicious intent. The ML classifier and ClamAV detection strongly indicate malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=what+are+the+7+spirits+of+god+in+revelation+5 PDF link annotation
    • https://cdn.sqhk.co/zesunotu/egezhcx/59965960593.pdfIn PDF document text
    • https://cdn.sqhk.co/bapuwanuvadi/mEhdjiA/5265035847.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxatotukaru/5jijcwv/invaluable_adjective_in_a_sentence_examples.pdfIn PDF document text
    • https://cdn.sqhk.co/wifepodilojo/hYBjdCa/the_lighthouse_streaming_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/woxiwovar/4CigifA/italian_musicians_famous.pdfIn PDF document text
    • https://cdn.sqhk.co/loxowopiv/Mjjjjha/nixeterupaxojorup.pdfIn PDF document text
    • http://jupowawixiz.iblogger.org/gakapere.pdfIn PDF document text
    • https://cdn.sqhk.co/suxupijisajo/ibjgbMo/16489505250.pdfIn PDF document text
    • https://cdn.sqhk.co/wepigosogo/iDgi4dz/kuxafunomutasimof.pdfIn PDF document text
    • http://vobigivu.22web.org/bevokipilafepuda.pdfIn PDF document text
    • https://cdn.sqhk.co/virurewev/lhcaggj/german_chocolate_cake_cooking_classy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zozadugaweguj.epizy.com/maglev_wind_turbine_with_ppt_seminar_report.pdfIn PDF document text
    • http://foweroboxufafuv.epizy.com/98217463510.pdfIn PDF document text
    • http://mibexumobanoko.rf.gd/sabovopuwimeso.pdfIn PDF document text
    • http://nirobow.epizy.com/positive_z_score_table_up_to_5.pdfIn PDF document text
    • http://navepufukoxo.rf.gd/fannie_mae_guidelines_regarding_mortgage_lates.pdfIn PDF document text
    • http://dokubuxopid.rf.gd/loan_amortization_schedule_excel_sheet.pdfIn PDF document text
    • http://pusaxedufa.rf.gd/rust_explosives_damage_guide.pdfIn PDF document text
    • http://fidusigugowubo.epizy.com/95237512172.pdfIn PDF document text
    • http://popomajuvuj.rf.gd/karthik_calling_karthik_movie_songs_ming.pdfIn PDF document text
    • http://zanipufikikuk.rf.gd/54003196012.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF169 5580 bytes
SHA-256: 2a247534c9731f8831e930e5b8ede8b1d064dd618f2983584a31fbffa6d0ced9
font_01_sfnt_off0001047e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047E 10740 bytes
SHA-256: 8f37d6ab45ea4547a76d7c13593e3d8809e027e74c9d1b7e7d7fdbc974be0bd9
font_02_sfnt_off00012924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12924 16028 bytes
SHA-256: ced8b21f0c91c47eb2a8e10a251844195ecd6fd413d2ce9a64032c85f057f195

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