Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd5a403019ab9071…

MALICIOUS

PDF

68.3 KB Created: 2021-02-24 17:42:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1fbab1e0aa60912b31a3de7d2d86e478 SHA-1: f40533a55386db13f8d67e83de41ea166bf5e4e6 SHA-256: dd5a403019ab90713dc080d1f90645aec2cbf722ee233b96030d9892a02a38a1
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=fender+mustang+amplifier+update+server+is+unreachable PDF link annotation
    • https://mokoxobijukox.weebly.com/uploads/1/3/4/3/134321678/xoxadeviwu.pdfIn PDF document text
    • https://zipelademijup.weebly.com/uploads/1/3/4/0/134017001/2653265.pdfIn PDF document text
    • https://cdn.sqhk.co/xuluriwu/jjRjhO0/vagipatakowuli.pdfIn PDF document text
    • https://sibuvavaxo.weebly.com/uploads/1/3/2/6/132681946/digojekazik_gemofivifosag_damirejusofolon_tovinanut.pdfIn PDF document text
    • https://cdn.sqhk.co/vazoguzo/jdXQKGG/90770293516.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/hackers_heroes_of_the_computer_revolution_by_steven_levy.pdfIn PDF document text
    • http://noxodexuvalolum.iblogger.org/chart_js_datalabels_formatter.pdfIn PDF document text
    • https://cdn.sqhk.co/sukijubese/kgdVcvV/wuzibipojinovifawib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xajejosiwoja.epizy.com/71543521954.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/identifying_prisms_and_pyramids_worksheets_grade_3.pdfIn PDF document text
    • http://kavunuses.epizy.com/uc_browser_hd_themes.pdfIn PDF document text
    • http://vubelifijam.atwebpages.com/57413766852.pdfIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/can_i_watch_sharp_objects_on_amazon_prime.pdfIn PDF document text
    • http://gakinodimojulat.rf.gd/61193297540.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/2_inch_circle_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/activity_evidence_of_evolution_answer_key.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_off0000cd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD00 5724 bytes
SHA-256: 0b4fb043773fb2d1f48c89f5b36a7d423def5f8461d0dd146491ec3fc57baa77
font_01_sfnt_off0000e057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE057 10364 bytes
SHA-256: 03b92f84b33008e4c6a899d5090aaaaee1bc3040045930fa654853b9eadf776f

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