Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed322fd9ad643eff…

MALICIOUS

PDF

72.0 KB Created: 2021-04-05 13:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3e9f9b25017d72b94361ee5186aa2e37 SHA-1: ccfd7190e40267772598f06132563a34ebc505df SHA-256: ed322fd9ad643eff3348a08e1e3983b2619bcea7d48563be7869278eafd45f01
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic findings point to the PDF acting as a link farm, with numerous external URIs hosted on disposable domains, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to 'pdf to word converter software', likely a lure to disguise the malicious nature of the links.

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://nipisod.ru/award?keyword=pdf+to+word+converter+software+free+download+for+mac PDF link annotation
    • http://xivazokib.medianewsonline.com/career_opportunities_in_business_studies.pdfIn PDF document text
    • http://bitiwiz.medianewsonline.com/9448242691.pdfIn PDF document text
    • https://vizepojazitebag.weebly.com/uploads/1/3/4/1/134108988/3611020.pdfIn PDF document text
    • http://labebatazavanoz.mygamesonline.org/nodovezuvatefatugod.pdfIn PDF document text
    • https://filajusarapobu.weebly.com/uploads/1/3/4/7/134761194/jepuzefefelujad-worukavomod-detawosasasolun-kotesopavesep.pdfIn PDF document text
    • https://joxisewegiwazev.weebly.com/uploads/1/3/4/6/134669132/xosuzulemajabimitabe.pdfIn PDF document text
    • http://lujuvudav.22web.org/virgin_mobile_answer_machine_number.pdfIn PDF document text
    • http://tesekal.mygamesonline.org/patedosoropubanawimib.pdfIn PDF document text
    • https://bemawavopul.weebly.com/uploads/1/3/4/6/134692962/wuwexos.pdfIn PDF document text
    • http://lazokiwumemo.mygamesonline.org/wd_my_cloud_2tb_wdbctl0020hwt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381751/normal_5fd3358eca677.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369783/normal_60661df329c51.pdfIn PDF document text
    • http://munasimowijuxi.getenjoyment.net/sidav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pigadupujegojum.rf.gd/zoselaxikusovuka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1985cb8-b282-48bb-ab1b-c029717f7f5b/powertec_workbench_multi_system_for_sale_craigslist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62003653-b097-4523-bcb9-ebcd47c47c1d/seven_myths_of_the_spanish_conquest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23382213-a973-4cc0-8777-f448a01e7972/40787694072.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a981b8d0-d62b-48de-b8cb-73fbb6dace42/the_odyssey_book_1-3_summary.pdfIn PDF document text
    • http://nabafutig.myartsonline.com/mathematical_optimization_eth.pdfIn PDF document text
    • http://vuxikujare.epizy.com/gsk_consumer_healthcare_annual_report.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_off0000daf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF3 5320 bytes
SHA-256: c02ec6cb61cd191a97710cc6249a89cbd69f45b5d6f2ddd2b871fbae3c868275
font_01_sfnt_off0000ed13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED13 10936 bytes
SHA-256: 7da8a9d5f70dda5aedf9898e64332f1f54cb3034082faa7390d6ba5e616decfb