Malicious PDF — malware analysis report

Static analysis result for SHA-256 d454a86149dc785a…

MALICIOUS

PDF

66.8 KB Created: 2021-02-21 10:49:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 01507102348e1631089838cc8880fd87 SHA-1: 9fcd385c2db22af445a5f73fd369fb4d97eee233 SHA-256: d454a86149dc785a43383d778f1440546617199004bcc376ffe5108f8a4790c3
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with one prominent URL pointing to 'jacksth.ru' which is likely part of a phishing or malware distribution campaign. The PDF structure and heuristics suggest it functions as a link farm, directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/123?utm_term=what+does+pop+culture+mean+examples PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4372384/normal_5feefbd38ee65.pdfIn PDF document text
    • http://benovezim.22web.org/32480753087.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422147/normal_5ffbea18ed026.pdfIn PDF document text
    • http://deteluwo.iblogger.org/bonaire_navigator_controller_manual.pdfIn PDF document text
    • http://rarebuzoxexovom.22web.org/mcent_browser_apkmonk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428061/normal_5fdaaf9d29895.pdfIn PDF document text
    • https://nozinogut.weebly.com/uploads/1/3/1/1/131164424/felutotulaxijife.pdfIn PDF document text
    • http://sexasuwodig.iblogger.org/is_the_keto_diet_good_for_diabetics_with_high_cholesterol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454679/normal_600c5225e0200.pdfIn PDF document text
    • http://sasezifunapa.iblogger.org/bharat_all_song_mr_jatt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://poziluxolebulu.epizy.com/silovokerugutazojoz.pdfIn PDF document text
    • http://fufamiwebo.epizy.com/nagibusonuwifobagaxozogus.pdfIn PDF document text
    • http://moxutomib.rf.gd/dutojapasipurifo.pdfIn PDF document text
    • http://sebipukavore.epizy.com/kinsey_report_poem.pdfIn PDF document text
    • http://baduwujik.rf.gd/90786967800.pdfIn PDF document text
    • http://mapulikilep.epizy.com/1765270645.pdfIn PDF document text
    • http://likifekedita.epizy.com/46373569517.pdfIn PDF document text
    • http://jafimogapevov.rf.gd/bhangra_dhol_tone.pdfIn PDF document text
    • http://xozelabudizi.epizy.com/61404557700.pdfIn PDF document text
    • http://zaxawogaxema.epizy.com/ionic_compounds_1_worksheet_answers.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_off0000c772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC772 5396 bytes
SHA-256: 33f256661b850f4ab3015487e3631de5fa7c478f89c20d4b1cfff216b2bfb886
font_01_sfnt_off0000d9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AD 10596 bytes
SHA-256: 488a42a7a8c72e5b97a70b1c58c12e187c9cd7c43cb85b4bb122b357016ece5d

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