Malicious PDF — malware analysis report

Static analysis result for SHA-256 f71f9aca1d4d6fad…

MALICIOUS

PDF

128.3 KB Created: 2021-03-19 09:59:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 648e2adb88976428bdd3926b1b170ae1 SHA-1: 950e923273628a3c732744d0d662dc339ef967ac SHA-256: f71f9aca1d4d6fadb8a6219f25c2e3c39d2373cbe876af12844c71cd0e56a104
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. 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 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://kuzutuzo.ru/strik?utm_term=what+are+the+advantages+of+distributed+database+management+system PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418778/normal_5ffe4a6fd3c07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454281/normal_602bfea3e2a74.pdfIn PDF document text
    • http://nemeloru.66ghz.com/alien_dance_song_mr_jatt.pdfIn PDF document text
    • https://cdn.sqhk.co/temejikowewa/4iajfM9/werokugenebixesotobiz.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/83716131634.pdfIn PDF document text
    • https://cdn.sqhk.co/baxajufim/cjchzok/1260581906.pdfIn PDF document text
    • http://juzufezike.mygamesonline.org/ray_bradbury_the_pedestrian_study_questions.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382962/normal_5fc8dd767fa6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426954/normal_604ae33b6a614.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446490/normal_5ffdcff11d27d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3d5b2cfc-74f5-4c02-8466-0d369b02955c.filesusr.com/ugd/69b86f_f65b4d457092455cb6f5decc8bf12adc.pdf?index=trueIn PDF document text
    • http://faxevimisosideg.myartsonline.com/ms_excel_advanced_tutorial.pdfIn PDF document text
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_d60634498e564fb9b174165c6a74f317.pdf?index=trueIn PDF document text
    • https://3682d434-6e27-4ac8-9ac2-d3ec24fa429c.filesusr.com/ugd/9b5f63_d61fe8e331444e66807348f2b2951443.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/what_are_the_key_words_for_multiplication.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/86937244086.pdfIn PDF document text
    • http://pojoviraxerojo.myartsonline.com/11282301972.pdfIn PDF document text
    • http://fuguzametekobo.myartsonline.com/zebovafuwezufefubirova.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/zamawusarimonexukiguroj.pdfIn PDF document text
    • http://xarozitapakegur.epizy.com/sesumazobiwezanewufo.pdfIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_458577b575f048e4ad07755aada2eddd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/banana_tree_care_guide.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_off0001b856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B856 5604 bytes
SHA-256: 8d08bd3cb357c6ad1d140091991a900661f44d7d920bf83b3777cd03f357c6de
font_01_sfnt_off0001cb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB51 11820 bytes
SHA-256: b3a945c0d45c92edeb95aa99b7947892823de1349c6575f6d87373aad2c6367c